成都七中自主招生考试题
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成都七中自主招生考试题电学部分1、如图4所示电路,电源电压8伏保持不变,电阻R1=20欧,当开关S 闭合后,电压表和 的示数之比是1:1, 和 的示数之比是5:3,则下列判断正确的是( )A. R2=20欧B. R3=30欧C.电流表 的示数为0.1安D.电路中消耗的总功率为0.8瓦2、如图所示的电路中,电源两端的电压保持不变,电阻R2与R3的阻值均为10Ω。
闭合开关S ,电流表A1和A2的示数之比为3:2。
若把电流表A1和A2分别换成电压表V1和V2后,电压表V1的示数为U1,电压表V2的示数为U2。
则下列选项正确的是:A 、R1=5Ω;B 、R1=20Ω;C 、U1:U2=3:4;D 、U1:U2=4:3.3、如图所示电路,电源两端电压U =7.5V ,且保持不变,R 为保护电阻, L 为标有“6V 3W”的小灯泡,不考虑灯丝电阻随温度的变化。
电流表量程为0~0.6A ,电压表量程为0~3V 。
闭合开关S 后,要求灯L 两端的电压不超过额定电压,且两电表的示数均不超过各自的量程,则关于保护电阻R 和滑动变阻器允许接入电路的最大阻值R’下列说法正确的是:A.当R<3Ω时,灯L 两端的电压可能超过6V;B.当R=3Ω时, R’不能超过10Ω ;C.当R>3Ω 时, R’可以等于任何值;D.无论R 取什么值 , R’都等于10Ω .4、在如图所示电路中,电源电压保持不变。
闭合开关S ,当滑动变阻器的滑片P 向下滑动时,四个电表的示数都发生了变化,电表的示数分别用I 、U1、U2和U3表示,电表示数变化量的大小分别用ΔI 、ΔU1、ΔU2和ΔU3表示,电阻R1、R2、R3消耗的电功率分别用p1、p2、p3表示,下列选项正确的是:A .U1/I 不变,ΔU1/ΔI 不变;B .U2/I 变大,ΔU2/ΔI 变大;C .U3/I 变大,ΔU3/ΔI 不变;D .滑动变阻器的滑片P 向下滑动时,p1变大,p2变小,p3变大.5、如图8所示电路,电源电压保持不变。
成都七中初升高自主招生考试试题集成都七中初升高自主招生考试试题数学试题卷I (选择题,共36分)一.选择题:本大题共12个小题,每小题3分,共36分.在每小题给出的四个选项中,只有一项是符合题目要求的.1.计算3×(-2) 的结果是( )A .5B .-5 C.6 D .-62.如图1,在△ABC 中,D 是BC 延长线上一点, ∠B = 40°,∠ACD = 120° ) A .60°B .70°C .80°D .90° 3.下列计算中,正确的是( ) A .020= B . 623)(a a = C .3± D .2a a a =+ 4.如图2,在□ABCD 中,AC 平分∠DAB ,AB = 3,则□ABCD 的周长为( )A .6B .9C .12D .15 5.把不等式2x -< 4的解集表示在数轴上,正确的是( ) 2011年成都石室中学实验学校自主招生考试试题理化试题(考试时间120分钟,满分200分)A BCD 图2 A BC D 40° 120°图1可能用到的相对原子质量:H 1 C 12 N 14 O 16 Fe 56 Cu 64第Ⅰ卷(选择题,共81分)一、选择题(每小题3分,共66分。
每小题只有一个选项是最符合题目要求的)1. 我市正在推广“LED”绿色节能光源。
砷化镓(GaAs)是光源材料,Ga为+3价,As的化合价为()A.+3B.﹣3C. +5D. ﹣52. 下列物品属于有机合成材料的是()A. 导电塑料B. 铝制电缆C. 越王勾践青铜剑D. 羊毛绒纺织品3. 化学与人们的生活紧密相连,用所学化学知识判断,下列做法或说法错误..的是()A. 天然气、瓦斯等气体和面粉、煤粉等固体粉尘都易发生爆炸B. 多吃水果蔬菜可以补充维生素,过多摄入微量元素不利健康C. 将自行车擦干净,并将其链条、钢圈等构件抹上油,可有效防止生锈D. 利用洗涤剂的乳化功能,可将白衬衣上的蓝墨水渍迅速洗掉4. 氯化钴(CoCl2)晶体因含结晶水数目不同而呈现不同的颜色,故可作硅胶干燥剂的指示剂和隐形墨水。
成都七中自主招生考试题电学部分 1、如图4所示电路,电源电压8伏保持不变,电阻R1=20欧,当开关S 闭合后,电压表 和 的示数之比是1:1, 和 的示数之比是5:3,则下列判断正确的是( )A. R2=20欧B. R3=30欧C.电流表 的示数为0.1安D.电路中消耗的总功率为0.8瓦2、如图所示的电路中,电源两端的电压保持不变,电阻R2与R3的阻值均为10Ω。
闭合开关S ,电流表A1和A2的示数之比为3:2。
若把电流表A1和A2分别换成电压表V1和V2后,电压表V1的示数为U1,电压表V2的示数为U2。
则下列选项正确的是:A 、R1=5Ω;B 、R1=20Ω;C 、U1:U2=3:4;D 、U1:U2=4:3.3、如图所示电路,电源两端电压U =7.5V ,且保持不变,R 为保护电阻, L 为标有“6V 3W”的小灯泡,不考虑灯丝电阻随温度的变化。
电流表量程为0~0.6A ,电压表量程为0~3V 。
闭合开关S 后,要求灯L 两端的电压不超过额定电压,且两电表的示数均不超过各自的量程,则关于保护电阻R 和滑动变阻器允许接入电路的最大阻值R’下列说法正确的是:A.当R<3Ω时,灯L 两端的电压可能超过6V;B.当R=3Ω时, R’不能超过10Ω ;C.当R>3Ω 时, R’可以等于任何值;D.无论R 取什么值 , R’都等于10Ω .4、在如图所示电路中,电源电压保持不变。
闭合开关S ,当滑动变阻器的滑片P 向下滑动时,四个电表的示数都发生了变化,电表的示数分别用I 、U1、U2和U3表示,电表示数变化量的大小分别用ΔI 、ΔU1、ΔU2和ΔU3表示,电阻R1、R2、R3消耗的电功率分别用p1、p2、p3表示,下列选项正确的是:A .U1/I 不变,ΔU1/ΔI 不变;B .U2/I 变大,ΔU2/ΔI 变大;C .U3/I 变大,ΔU3/ΔI 不变;D .滑动变阻器的滑片P 向下滑动时,p1变大,p2变小,p3变大.5、如图8所示电路,电源电压保持不变。
2013年必备四川省成都七中自主招生考试物理试卷及解析历年成都七中自主招生考试物理试卷及解析------------菁优网整理版一、单项选择题(每题3分,共60分)1.三种材料的密度之比为3:2:1,取其质量之比为1:2:3,制成相同高度的圆柱体竖立在水平桌面上,它们对桌面产生的压强之比是()A.1:2:3 B.3:2:1 C.1:4:9 D.1:1:12.甲、乙两种物质,质量之比为4:1,放出热量之比是3:1,则它们的比热之比和降低温度之比分别是下列四种情况,可能满足题设条件的是()①1:13:4;②2:11:3;③1:23:2;④1:39:4.A.①②B.①③④C.②③D.①②④3.一台效率为40%的柴油机,当输出3.44×107J有用功时,消耗的柴油质量是多少?()(柴油的热值是4.3×107J/kg)A.0.8kg B.2kg C.0.32kg D.2.8kg4.如图所示,滑动变阻器M的总电阻为10Ω,滑动变阻器N的总电阻为200Ω,电阻R的阻值约为20Ω.为了使电压表的示数略微增大,应该()A.把N的滑片向左移一小段距离B.把M的滑片向左移一小段距离C.把N的滑片向右移一小段距离D.投M的滑片向右移一小段距离5.(2006•资阳)自然界的许多动物为了适应生存环境,进化出了符合一定科学规律的身体部位.对此,下列给出的解释中错误的是()A.鱼类主要是靠鳔的调节作用从而改变自身重力来实现下沉和上浮的B.蚊子细尖的口器,可以增大压强,易于刺穿皮肤吸取人和动物体内的血液C.大象长有两个大大的耳朵,不仅可以发挥听觉功能,还能用于散热D.地震、海啸等自然灾害发生前,猫、狗、老鼠和蛇等动物大都会有异常表现,是因为这些动物可感知地壳内部运动发出的次声波6.如图所示电路,灯L1、L2的额定电压分别为2V、10V,S1闭合,S2断开,滑动变阻器滑片置于中点位置时,两灯均正常发光.S2闭合后,移动变阻器滑片使L2仍正常发光时,下列关于滑片位置和电流表示数的说法正确的是()A.滑片在中点右侧,电流表示数变小B.滑片在中点左侧,电流表示数变大C.滑片在中点右侧,电流表示数不变D.滑片在中点左侧,电流表示数不变7.(2006•厦门)如图所示,滑动变阻器的滑片在某两点间移动时,电流表示数范围为1A到2A之间,电压表示数范围为6V到9V之间.则定值电阻R的阻值及电源电压分别为()A.3Ω,15V B.6Ω,15V C.3Ω,12V D.6Ω,12V8.将一个体积不随温度变化的物体放入盛水的烧杯中,当烧杯中的水温为5℃时,物体恰好悬浮在水中处于静止.此时在烧杯周围放置一些碎冰,使水温缓慢地降至0℃,在此过程中,浸在水中的物体的运动情况是()A.一直向上运动B.一直向下运动C.先向下运动,后又向上运动D.先向上运动,后又向下运动9.如图所示,L是电磁铁,在L正上方用弹簧悬挂一条形磁铁,设电源电压不变,闭合电键S待电磁铁稳定后,当滑动变阻器R的滑片由上向下缓缓地滑动过程中,弹簧的长度将()A.先变短后变长B.先变长后变短C.变短D.变长10.(2006•菏泽)下面是小红从物理学角度对一些现象或做法的解释,其中错误的是()A.农民在农田中焚烧秸杆,既浪费能源,又污染环境B.小强用绳牵扯着一个小球在空中做匀速圆周运动时,小球受到的力是平衡力C.开启啤酒瓶盖的瞬间会伴有“嘭”的响声,高压气体冲出后,啤酒的温度会降低D.如图,用斜面将物体升高,尽量选用表面光滑些的木板,这样可以提高斜面的机械效率11.在“探究凸透镜成像”实验中烛焰在光屏上成一个清晰缩小的像,光屏离凸透镜的距离为20cm;当蜡焰距凸透镜的距离为30cm时,烛焰所成的像()A.只可能是倒立缩小的实像B.只可能是倒立放大的实像C.只可能是正立放大的像D.倒立放大、缩小或等大的实像都可能12.有四个完全相同的均匀正方体木块放在水平桌上,现将甲、乙、丙截去完全相同的两截面均为正方形的长方体(图中阴影部分)后,它们对桌面的压强分别为P甲、P乙、P丙和P丁,则()A.P丁>P甲=P乙=P丙B.P乙>P丙>P丁>P甲C.P乙>P丙=P丁>P甲D.P乙>P丁>P丙>P甲13.如图所示,容器内有水,有一塑料试管下面挂一小铁块,浮在水面上.现将小铁块取下放入试管中,试管仍浮在水面,则()A.液面上升B.液面下降C.容器底部受到液体的压强不变D.试管外壁上A点受到液体的压强不变14.如图所示,吊篮的重力为400N,动滑轮重力为50N,定滑轮重力为40N,人的重力为600N,人在吊篮里拉着绳子不动时需用力()A.218N B.220N C.210N D.236N15.有一段长为18m的装满水的铁管,将耳朵贴在装满水的铁管一端,在另一端敲一下,能听到几次声音?(已知:声音在铁、水和空气中的传播速度依次为5200m/s、1500m/s和340m/s.人耳能分清前后两次声音的时间间隔要大于0.1s)()A.1次B.2次C.3次D.4次16.用电阻丝加热某种物质,得到如图所示的熔化图象.电阻丝的发热的功率为P,放出的热量有50%被该物质吸收,该物质的质量为m,则这种物质比热容的大小为(假设这种物质固态和液体的比热容相同)()A.小于B.大于C.等于D.等于17.(2010•宜昌)伟大领袖毛泽东在《沁园春•雪》中写到“北国风光,千里冰封,万里雪飘”,形成这种自然景色的主要物态变化是()A.熔化和汽化B.凝固和液化C.凝固和凝华D.汽化和升华18.下面所做的验证性实验中,不正确的是()A.在圆盘上间隔涂上红、蓝、绿等色,旋转后圆盘呈白色,说明白光是由色光组成的B.在冷水、热水中各加入一滴墨水,发现热水变色快,说明分子热运动与温度有关C.将磁体靠近通电的灯泡,发现灯丝抖动,说明通电导体在磁场中受到力的作用D.从滑梯上滑下时臀部有灼热感,说明热传递可以改变物体的内能19.(2006•贵阳)下列关于移动电话的说法中,错误的是()A.移动电话既能接收电磁波,也能发射电磁波B.移动电话发射功率非常大,其天线的灵敏度很高C.移动电话与其他用户通话需基地台转接D.移动电话用微波信号与电话网络联系20.小红的明视距离是:左眼20cm,右眼10cm,他想配眼镜矫正,其左眼、右眼选择的镜片分别是()A.+100度,+600度B.+600度,﹣100度C.﹣600度,﹣100度D.﹣100度,﹣600度二、填空题(第23、25、29、30、32题每空2分,其余每空1分,共25分)21.干湿温度计是用两个相同的温度计并列制成的,在使用时,其中一个温度计下端的玻璃泡包围着湿布,因为水在蒸发时要_________;所以这个温度计的读数要比另一个的读数_________(选填“大”或“小”).在相同的室温下,两个读数的差值越大,就表明空气中的水蒸气含量_________(选填“多”或“少”).22.有一根高度为1m的竖直放置的标杆,在太阳光照下,它的影长为1.1m.同时有一根竖直放置的电线杆,它的高度是6m,影长为_________m.23.在地球表面附近,每升高10m,大气压就减小100Pa,从天空飞行的飞机上测得大气压为0.9×105Pa,此时地面上的大气压为1×105Pa,由此可知飞机的飞行高度是_________m.24.现有两个分别标有“6V 6W”和“3V 6W”的灯泡L1和L2,若将它们并联后接在某一电源上,使其中一个灯泡正常发光,干路允许通过的最大电流是_________A.若将它们串联后接在某一电源上,使其中一个灯泡正常发光,则电源电压是_________V.25.一尊大理石人像的高度是质量为50kg的人的高度的两倍,若大理石的密度是2.7×103kg/m3,人的密度大约是1.0×103kg/m3.可以估算这尊石像的质量大约是_________kg.26.一列车正以18km/h的速度由北向南在雨中行驶,坐在窗口的乘客看到雨正好竖直下落至地面.这一下现象说明车窗外刮的是_________风,风速是_________m/s.27.电磁波在真空中的传播速度等于_________m/s,某电磁波的频率为6×108Hz,此电磁波的波长为_________ m,光纤通信实际上是利用_________在光导纤维里传播的.28.(2006•贵阳)能源问题是现代社会发展的三大基本要素之一.能源家族中有:①柴薪、②煤炭、③石油、④天然气、⑤水能、⑥风能、⑦太阳能、⑧地热能等,在大量耗用各种能源时,会造成空气污染的有_________;会造成水土流失和沙漠化的有_________(填题序号).29.螺旋常和杠杆连接在一起使用,达到省力的目的,那么使用螺旋时如何省力的呢?下面以举重螺旋(千斤顶)为例进行分析.下图为举重螺旋的结构示意图,设螺距为h,螺旋手柄末端到螺旋轴线的距离为L,当螺旋旋转一周时,重物被升高一个螺距.若这个螺旋的机械效率为η,用它将重力为G的物体举起,需要作用在手柄上的动力F为_________.30.一段粗细均匀的电阻丝电阻值为16Ω,将它围成一个封闭的圆圈,如图所示,则A、B两点间的电阻为_________Ω.31.(2008•齐齐哈尔)为测量待测电阻R x阻值,小敏设计了如图所示的电路,R0的阻值已知且电源电压不变,所选用的电压表为零刻度线在表盘刻度线最左端的电压表,她_________(选填“能”或“不能”)测出R x的阻值.因为_________.32.潮汐能是由于地球和月球、太阳相互作用产生的能量,一日两次,日称潮,夜称汐,世界上潮汐能蕴藏量约为10亿千瓦,我国约有1.1亿千瓦.我国东南沿海某海湾测量面积为1.0×107m2,涨潮时水深20m,此时关上水堤闸门,可使水位保持20m不变,退潮时,堤外水位降至18m,假如利用此水堤建潮汐水力发电站,水的势能变为电能的效率是10%.每天有两次涨潮,问该电站一天能发的电能是_________J.(g取10N/kg)三、实验、探究题(第33题8分,第34题16分,共24分)33.小东想估测出某种油的密度ρ油,他手边的测量工具只有刻度尺.小东利用身边的器材设计出一个实验方案.首先找一根直硬棒,用细线系在O点吊起,硬棒在水平位置平衡,然后将已知密度为ρ的金属块B挂在硬棒左端C 处,另外找一个重物A挂在硬棒右端,调节重物A的位置,使硬棒在水平位置平衡,此时重物挂在硬棒上的位置为E,如图所示.下面是小东测出ρ油的部分实验步骤,请你按照小东的实验思路,将实验步骤补充完整.(1)用刻度尺测出OE的长度L0;(2)把金属块B浸没在待测油中,把重物A从E处移动到D处时,硬棒再次在水平位置平衡;(3)_________;(4)利用上述测量出的物理量和题中的已知量计算ρ油的表达式为:_________.34.(2008•自贡)图甲所示是“测定小灯泡的功率”实验的电路图,图乙是即将连接完成的实验电路,其中电源为三节新干电池,灯泡的额定电压为3.8V,灯丝的电阻约为10Ω,滑动变阻器标有“10Ω1A”字样.(1)对照电路图,用笔画线代替导线,将图乙所示的实验电路中未连接部分连接好.(2)当闭合电路中的开关时,若出现以下不正常现象(见下表)请你从下列选项中选择可能的原因填入上表中(只填选项代号)A.电路中a、b间断路B.电路中a、b间短路C.滑动变阻器连入电路中的电阻太小(3)为了测出小灯泡的额定功率,应调节滑动变阻器使电压表示数为_________V,若此时电流表的示数如图所示,其电流为_________A,该灯的额定功率是_________W.四、计算与简答(第35题10分,第36题11分,共21分)35.北方的冬天,室外很冷,可交通警察还要长时间站在道路上指挥交通.某同学为交警同志设计了一种保温鞋,设计的电路如图所示,其中R1为9Ω的发热电阻,R2为调节电阻,此电路具有加热档和保温档.已知两种工作状态下发热电阻的功率之比为9:1,调节电阻在保温状态下的功率为2W,求:(1)调节电阻的阻值;(2)电源电压;(3)发热电阻在加热状态下,每小时产生的热量.36.环境保护是现代社会的热点,环境污染是世界各国关注的焦点,核污染更是全人类高度警惕的问题.继1986年“切尔诺贝利”核泄漏事件之后,2000年8月12日,质量m=1.4×107kg的俄罗斯“库尔斯克”号核潜艇在巴伦支海遇难,引起挪威生态保护组织和国际社会普遍关注.(海水密度近似取作ρ=1.0×103kg/m3,g=10N/kg)(1)核裂变和核聚变是大量获得核能的两种途径,核潜艇反应堆的核能是通过哪种途径获得的?(2)探测专家用超声波可探测到潜艇的确切位置,超声波在海水中的波速v=1500m/s,在潜艇正上方海面向下发出超声波,从超声波发出直至接收到潜艇的回波经历的时间t=0.14s.则潜艇沉没的实际深度h为多大?(3)经研究,“库尔斯克”号的打捞方案之一,是在潜艇周围缠满可充气的负荷量大的浮力袋,若每只浮力袋充气后的体积v0=10m3,试估算需用这种浮力袋多少只?(4)按海滩救援国际惯例,8月19日晚,挪威潜水艇曾抵达“库尔斯克”号并打开紧急逃生舱盖,若舱盖面积S=0.6m2,则海水对舱盖的压力F多大?(5)救援人员在“库尔斯克”号发现了记录潜艇各种信息的“黑匣子”,其某一部件外壳上三个电压表的示数分别为U1、U2、U3;三个电流表的示数分别为I1、I2、I3,它内部的电路结构图所示,试分别写出U1、U2、U3之间的数学关系表达式和I1、I2、I3之间的数学关系表达式.附参考答案与试题解析一、单项选择题(每题3分,共60分)1.三种材料的密度之比为3:2:1,取其质量之比为1:2:3,制成相同高度的圆柱体竖立在水平桌面上,它们对桌面产生的压强之比是()A.1:2:3 B.3:2:1 C.1:4:9 D.1:1:1考点:压强的大小及其计算;密度公式的应用;重力的计算。
成都七中实验学校自主招生考试试题数学试题注意事项:1.本试题分第Ⅰ卷和第Ⅱ卷两部分.第Ⅰ卷为选择题36分;第Ⅱ卷为非选择题114分;全卷共150分.考试时间为120分钟.2.本试卷的选择题答案用2B 铅笔涂在机读卡上,非选择题在卷Ⅱ上作答.3.考生务必将自己的姓名及考号写在密封线以内指定位置.4.非选择题必须在指定的区域内作答,不能超出指定区域或在非指定区域作答,否则答案无效.卷I (选择题,共36分)一.选择题:本大题共12个小题,每小题3分,共36分.在每小题给出的四个选项中,只有一项是符合题目要求的.1.计算3×(-2) 的结果是( )A .5B .-5C .6D .-62.如图1,在△ABC 中,D 是BC 延长线上一点, ∠B = 40°,∠ACD = 120°,则∠A 等于( ) A .60° B .70°C .80°D .90°3.下列计算中,正确的是( )A .020=B . 623)(a a =C 3=±D .2a a a =+4.如图2,在□ABCD 中,AC 平分∠DAB ,AB = 3, 则□ABCD 的周长为( ) A .6 B .9 C .12D .155.把不等式2x -< 4的解集表示在数轴上,正确的是( )6.如图3,在5×5正方形网格中,一条圆弧经过A ,B ,C 三点,AB CD图2ABCD 40°120°图1A B DC-2那么这条圆弧所在圆的圆心是( ) A .点P B .点M C .点RD .点Q7.若220x x +=,则xy 的值为( )A .6或0B .6-或0C .5或0D .8-或08.已知y x a b b y b b a x b a ,,,,0则--=-+=<<的大小关系是 ( )A .y x >B .x =yC .y x <D .与a 、b 的取值有关 9.如图4,已知边长为1的正方形ABCD ,E 为CD 边的中点,动点P 在正方形ABCD 边上沿A B C E →→→运动,设点P 经过的路程 为 x ,△APE 的面积为y ,则y 关于x 的函数的图象大致为( )10.如图5,两个正六边形的边长均为1,其中一个正六边形 一边恰在另一个正六边形的对角线上,则这个图形(阴影部 分)外轮廓线的周长是( )A .7B .8C .9D .1011.如图6,已知二次函数2y ax bx c =++的图像如图所示,则下列6个代数式,,,,2,ab ac a b c a b c a b ++-++2a b -中其值为正的式子个数为( )A .1个B .2个C .3个D .4个12.将正方体骰子(相对面上的点数分别为1和6、2和5、3和4)放置于水平桌面上,如图7-1.在图7-2中,将骰子向右翻滚90°,然后在桌面上按逆时针方向旋转90°,则完成一次变换.若骰子的初始位置为图7-1所示的状态,那么按上述规则连续完成10次变换后,骰子朝上一面的点数是( )卷Ⅱ(非选择题,共114分)图7-1图7-2图5(C )二.填空题:本大题共6个小题,每小题4分,共24分.将答案直接填写在题中横线上.13.5-的相反数是 .14.如图8,矩形ABCD 的顶点A ,B 在数轴上, CD = 6, 点A 对应的数为1-,则点B 所对应的数为 .15.如图9,有五张点数分别为2,3,7,8,9的扑克牌, 从中任意抽取两张,则其点数之积是偶数的概率为 .16.已知x = 1是一元二次方程02=++n mx x 的一个根,则 222n mn m ++的值为 .17.把三张大小相同的正方形卡片A ,B ,C 叠放在一 个底面为正方形的盒底上,底面未被卡片覆盖的部分用 阴影表示.若按图10-1摆放时,阴影部分的面积为S 1; 若按图10-2摆放时,阴影部分的面积为S 2,则S 1 S 2(填“>”、“<”或“=”). 18.南山中学高一年级举办数学竞赛,A 、B 、C 、D 、E 五位同学得了前五名,发奖前,老师让他们猜一猜各人的名次排列情况. A 说:B 第三名,C 第五名; B 说:E 第四名,D 第五名; C 说:A 第一名,E 第四名; D 说:C 第一名,B 第二名; E 说:A 第三名,D 第四名.老师说:每个名次都有人猜对,试判断获得第一至第五名的依次为 .三、解答题(本大题共7个小题,共90分.解答应写出文字说明、证明过程或演算步骤) 19.(1)(本小题满分8分)解方程:1211+=-x x . (2)(本小题满分8分)先化简再求值: 22214()2442a a a a a a a a ----÷++++,其中22430a a +-=. 20.(本小题满分12分)甲、乙两校参加区教育局举办的学生英语口语竞赛,两校参赛人数相等.比赛结束后,发现学生成绩分别为7分、8分、9分、10分(满分为10分).依据统计数据绘制了如下尚不完整的统计图表.甲校成绩统计表图10-1 ACB C BA图10-2 乙校成绩扇形统计图 图11-110分 9分8分72° 54°7分 A 0图8BC D 图9(1)在图11-1中,“7分”所在扇形的圆心角 等于 °.(2)请你将图11-2的统计图补充完整.(3)经计算,乙校的平均分是8.3分,中位数是8分,请写出甲校的平均分、中位数;并从平均分和中位数的角度分析哪个学校成绩较好.(4)如果该教育局要组织8人的代表队参加市级团体赛,为便管理,决定从这两所学校中的一所挑选参赛选手, 请你分析,应选哪所学校?21.(本小题满分12分) 如图12,在直角坐标系中,矩形OABC 的顶点O 与 坐标原点重合,顶点A ,C 分别在坐标轴上,顶点B 的坐标为(4,2).过点D (0,3)和E (6,0)的直 线分别与AB ,BC 交于点M ,N .(1)求直线DE 的解析式和点M 的坐标;(2)若反比例函数xmy =(x >0)的图象经过点M ,求该反比例函数的解析式,并通过计算判断点N 是否在该函数的图象上;(3)若反比例函数xmy =(x >0)的图象与△MNB 有公共点,请直接..写出m 的取值范围. 22.(本小题满分12分)某仪器厂计划制造A 、B 两种型号的仪器共80套,该公司所筹资金不少于2090万元,但不超过2096万元,且所筹资金全部用于制造仪器,两种型号的制造成本和售价如下表:(1)该厂对这两种型号仪器有哪几种制造方案? (2)该厂应该选用哪种方案制造可获得利润最大?(3)根据市场调查,每套B 型仪器的售价不会改变,每套A 型仪器的售价将会提高a 万元(a >0),且所制造的两种仪器可全部售出,问该厂又将如何制造才能获得最大利润?乙校成绩条形统计图图13-2AD O BC 21MN图13-1A D BM N1 2图13-3AD O BC 21MNO 23.(本小题满分12分)在图13-1至图15-3中,直线MN 与线段AB 相交 于点O ,∠1 = ∠2 = 45°.(1)如图13-1,若AO = OB ,请写出AO 与BD 的数量关系和位置关系;(2)将图13-1中的MN 绕点O 顺时针旋转得到 图13-2,其中AO = OB . 求证:AC = BD ,AC ⊥ BD ;(3)将图13-2中的OB 拉长为AO 的k 倍得到 图13-3,求ACBD的值. 24.(本小题满分12分)如图14,在直角梯形ABCD 中,AD ∥BC ,90B ∠=︒,AD = 6,BC = 8,33=AB ,点M 是BC 的中点.点P 从点M 出发沿MB 以每秒1个单位长的速度向点B 匀速运动,到达点B 后立刻以原速度沿BM 返回;点Q 从点M 出发以每秒1个单位长的速度在射线MC 上匀速运动.在点P ,Q 的运动过程中,以PQ 为边作等边三角形EPQ ,使它与梯形ABCD 在射线BC 的同侧.点P ,Q 同时出发,当点P 返回到点M 时停止运动,点Q 也随之停止. 设点P ,Q 运动的时间是t 秒(t >0).(1)设PQ 的长为y ,在点P 从点M 向点B 运动的过程中,写出y 与t 之间的函数关系式(不必写t 的取值范围). (2)当BP = 1时,求△EPQ 与梯形ABCD 重叠部分的面积. (3)随着时间t 的变化,线段AD 会有一部分被△EPQ 覆盖,被覆盖线段的长度在某个时刻会达到最大值,请回答:该最 大值能否持续一个时段?若能,直接..写出t 的取值范围; 若不能,请说明理由.Q图14 (备用图)25.(本小题满分14分)如图15,抛物线2(0)y ax bx c a =++≠经过x 轴上的两点1(,0)A x 、2(,0)B x 和y 轴上的点3(0,)2C -,P 的圆心P 在y 轴上,且经过B 、C两点,若b =,AB =求:(1)抛物线的解析式;(2)D 在抛物线上,且C 、D 两点关于抛物线的对称轴对称,问直线BD 是否经过圆心P ? 并说明理由;(3)设直线BD 交P 于另一点E ,求经过点E 和P 的切线的解析式.2011年数学参考答案一、选择题二、填空题13.5 14.5 15. 71016.1 17. = 18. C 、B 、A 、E 、D. 三、解答题19.(1)解:)1(21-=+x x ,3=x .经检验知,3=x 是原方程的解.………………8分(2)解:………………6分由已知得2322a a +=,代入上式的原式23=………………8分20.解:(1)144;………………3分(2)如图1;………………6分(3)甲校的平均分为8.3分,中位数为7分;………………8分 由于两校平均分相等,乙校成绩的中位数大于甲 校的中位数,所以从平均分和中位数角度上判断, 乙校的成绩较好.………………9分乙校成绩条形统计图图12222222212[](2)(2)4(2)(2)(1)2(2)442(2)442(2)41(2)12a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a--+=-⨯++--+--+=⨯+---++=⨯+--+=⨯+-=+=+原式(4)因为选8名学生参加市级口语团体赛,甲校得10分的有8人,而乙校得10分的只有5人,所以应选甲校.………………12分21.解:(1)设直线DE 的解析式为b kx y +=, ∵点D ,E 的坐标为(0,3)、(6,0),∴ ⎩⎨⎧+==.60,3b k b解得 ⎪⎩⎪⎨⎧=-=.3,21b k ∴ 321+-=x y .………………2分∵ 点M 在AB 边上,B (4,2),而四边形OABC 是矩形, ∴ 点M 的纵坐标为2.又 ∵ 点M 在直线321+-=x y 上,∴ 2 = 321+-x .∴ x = 2.∴ M (2,2).………………4分(2)∵xmy =(x >0)经过点M (2,2), ∴ 4=m .∴xy 4=.………………5分又 ∵ 点N 在BC 边上,B (4,2), ∴点N 的横坐标为4.∵ 点N 在直线321+-=x y 上,∴ 1=y .∴ N (4,1). ………………8分∵ 当4=x 时,y =4x= 1, ∴点N 在函数 xy 4=的图象上.………………9分 (3)4≤ m ≤8.………………12分22.解:(1) 设A 种型号的仪器造x 套,则B 种型号的仪器造(80-x)套, 由题意得:()20968028252090≤-+≤x x解之得:5048≤≤x ………………2分所以 x=48、49、50 三种方案:即:A 型48套,B 型32套;A 型49套,B 型31套;A 型50套,B 型30套。
四川省成都七中自主招生模拟试题物理试卷一、选择题1.下列关于光现象的描述,错误的是A.图甲中漫反射的反射光线虽然杂乱无章,但仍遵循光的反射定律B.图乙是人们常说的“天狗吃月”,这一现象是由光的直线传播形成的C.图丙是炎热夏天沙漠中出现的海市蜃楼景象,它是由光的反射形成的D.图丁是光的色散现象,说明白光是由各种色光混合而成的2.电动平衡车是一种时尚代步工具.如图所示,当人驾驶平衡车在水平路面上匀速直线运动时,下列说法正确的是A.平衡车受到的重力与地面对它的支持力是一对平衡力B.平衡车对地面的压力与地面对它的支持力是相互作用力C.关闭电机,平衡车仍继续前进是由于其受到惯性作用D.若平衡车在运动过程中所受的力全部消失,平衡车会慢慢停下来3.如图所示,将一个条形磁铁置于水平桌面上,电磁铁左端固定在竖直墙壁上并保持水平。
当开关S闭合后,条形磁铁能保持静止状态,下列说法正确的是()A.条形磁铁受到的摩擦力的方向是水平向右的B.条形磁铁受到的摩擦力的方向是水平向左的C.在滑片P向上移动的过程中,电磁铁的磁性减弱D.在滑片P向下移动的过程中,条形磁铁所受的摩擦力增大4.在防范新冠肺炎的疫情中,体温计发挥了重要作用。
如图所示的是一支常用体温计,下列关于该体温计的说法中错误的是()A.它的示数是38C︒B.它的分度值是1C︒C.它能离开被测物体读数D.它是根据液体热胀冷缩规律制成的5.地磁场被称为地球生命的“保护伞”。
如图从太阳向其他星体发射出来的高速带电粒子流,在接近地球时,地磁场会改变其运动方向,使其偏离地球,对地球起到了保护作用,以下各图与其原理相同的是()A.B.C.D.6.如图是一款太阳能座椅,椅子顶部安装的硅光电池板,可储备能量供晚间使用,下列说法正确的是A.硅光电池板是由超导材料制成的B.硅光电池板可以将太阳能转化为电能C.太阳能来源于太阳内部氢核的裂变D.太阳能属于不可再生能源7.如图所示,叠放在一起的A、B两物体在水平拉力F的作用下,沿水平方向起向右做勾速直线运动,下列说法正确的是()A.A、B之间无摩擦力B.B受到A施加的摩擦力方向水平向右C.A对B的压力与地面对B的支持力是一对作用力与反作用力D.地面对B的支持力与B受到的重力是一对平衡力8.如图所示,压在杯底的乒乓球,上浮时会弹离水面后又落回水面。
英语(考试时间:100分钟满分:100分)I. 选择题(20%)1. Two days isn’t enough for me to finish the work. I need____day.A. a thirdB. the thirdC. the otherD. other2. There are four____and two____at the____.A. Johns, Marys, doctorsB. Johns, Marys, doctor’sC. John’s, Mary’s, doctor’sD. John, Mary, doctor’s3. ----I’m looking forward____taking a holiday in Hainan.----So am I. It’s great to be____holiday there.A. for, onB. to, atC. to, onD. for, at4. Read t he sentence carefully and you’ll see you’ve____a verb in it.A. lostB. goneC. missedD. left5. The teacher did what she could____that child.A. to helpB. helpingC. helpedD. helps6. The sharks in the sea will ______ people.A. driveB. keepC. attackD. protect7. There ____ a number of animals in the zoo. The number of them ____ two thousand.A. is, areB. are, isC. is, isD. are, are8. The visitors ______ lions _____ meat.A. feed, onB. feed, toC. give, toD. eat, from9. “Elevator” means ______.A. light in British EnglishB. light in American EnglishC. lift in British EnglishD. lift in American English10. He’s neve r ridden the horse before, ______?A. is heB. isn’t heC. has heD. hasn’t he11. You’ll like it if you ______ on the sea.A. are surfingB. will surfC. surfedD. have surfed12. Do you know _______?A. what he happenedB. what the matter is with himC. what happened to himD. what did he happened13. He asks me ______ to use the computer.A. whyB. ifC. whetherD. what14. She _____ for ten hours at least. It was at nine that she fell asleep last night.A. sleptB. had sleptC. has sleptD. was sleeping15. --- What would you like to eat?--- I don’t mind. _______ --- whatever you’ve got.A. SomethingB. EverythingC. AnythingD. Nothing16. I’m sorry you told him the secret. I wish you _____ him the secret.A. didn’t tellB. wouldn’t tellC. will not tellD. had not tell17. --- Do you mind if I smoke here? --- _______.A. Pardon, I doB. Yes, not at allC. No, I do mindD. I’m sorry, but I do18. The camel was blind _____ the right eye and only ate the grass _____ the leftside.A.on;inB.in;onC.in;atD.at;on19. Korea(朝鲜) is _____ Asia. It's _____ the northeast of China and _____ the west of Japan.A. in; to; onB. in; on; toC. on; in; toD. to; on; in20. A stone hit _____ and he fell down on the ground.A. at Tom's headB. on Tom's headC.Tom on the headD.Tom at the headII. 完型填空30%A.In one way of thinking. failure is part of life. In 1 way, failure may be a way towards success. The “Spider-story” is often 2 .Robert Bruce , leader of the Scots in the 13 th century, was hiding in a cave from the English. He watched aspider 3 a web. The spider tried to reach across a rough 4 in the rock. He tried six times. On the 5 time he made it and went on to make his web. Bruce is said to have been encouraged by this and to have gone on to 6 the English . Edison , the inventor of the light bulb, made7 models that failed before he found the right way to make one. Once he was asked 8 he kept on trying to make a new type of battery when he had failed so often, he replied, “Failure? I have 9 failure. Now I know 50,000 ways it won't 10 ”.So what? First,always think about your failure. What caused 11 ?Were conditions right? Were you in top from yourself? What can you change? So things will go 12 next time.Second, is the goal you're trying to reach the right one? Try to do some 13 about what your real goals may be. Think about this question. “If I do succeed in this, where will it get me?" This may help you prevent failure in things you shouldn't be doing any way.The third thing to keep in 14 about failure is that it's a part of life. Learn to “live with yourself" even though you may have 15 .1. A. other B. another C. first D. second2.A. told B. said C. talked D. spoken3. A. doing B. taking C. making D. playing 4.A. room B. house C. place D. soil5. A. tenth B. sixth C. eighth D. seventh 6.A. save B. help C. defeat D. kill7.A. hundred B. hundreds C. hundred of D. hundreds of8. A. why B. when C. what D. who9. A. not B. no C. never D. nothing 10.A. do B. make C. took D. work11. A. one B. it C. that D. this12.A. high B. large C. right D. bright13.A. Thinking B. shopping C. reading D. cleaning14. A. heart B. eyes C. ears D. mind15. A. failed. B. succeeded C. finished D. passedB.A schoolboy’s life is in p reparation for the real battle of life. It is also 1 of differences and interests. One of the 2 important parts of a schoolboy’s life is to get 3 knowledge and good mind-training as he can . His 4 business in school is to learn. He 5 to read the book he is 6 in the classes. He has to do the homework set to him. Another part that forms a schoolboy's life is the school discipline(纪律).At school there are7 rules 8 .This strict discipline is very 9 for him when he 10 the society to 11 a living. It teaches him some very necessary virtues(美德)on the road to a 12 life.School is a place for a schoolboy to learn what the social life is 13 .For in the classroom and the playground, he has to mix with his fellows and not members of his family.He cannot behave(表现)as he does in his home. He is no longer a spoilt(宠坏的)child, and his school fellows will not give 14 to his wishes. He soon gets his corners robbed of and learns the lesson of giv-and-take, good manners, and thought for 15 .This is also the way when he has to carry himself in society.1. A. full B. fond C. sure D. short2. A. larger B. greater C. most D. different3. A. many as B. little C. as much D. more4. A. mostly B. main C. almost D. partly5. A. has B. likes C. requires D. obliges6. A. learned B. studied C. examined D. taught7. A. hard B. strict C. loose D. kind8. A. kept B. being kept C. keeping D. to be kept9. A. useful B. harmful C. bad D. pleasant10. A. enters B. leaves C. comes D. organizes11. A. produce B. make C. get D. take12. A. successful B. rich C. poor D. famous13. A. like B. on C. up D. for14. A. in B. up C. off D. out15. A. himself B. teachers C. others D. his parentsIII. 阅读理解: 20% 最后一文2分1题A 5%New Schedules of Cathy Pacific Airways1. The above is a _______.A. pictureB. piece of newsC. tableD. schedule2. It gives information to people who are going between Shanghai and Hong Kongor Beijing and Hong Kong ___.A. by carB. by trainC. by airD. by sea3. There are _____ flights from Shanghai to Hong Kong every week.A. threeB. fourC. fiveD. six4. There are _____ flights between Hong Kong and Beijing each week.A. threeB. fourC. fiveD. six5. Suppose, on arriving in Shanghai by Cathy Pacific on Thursday, you’re told to return to Hong Kong by Cathy Pacific Airways at once. Now the most proper way is _____.A. to wait until SaturdayB. to stay in Shanghai and take the Friday’s flight from Beijing to Hong KongC. to go to Beijing and take the Friday’s flightD. to take the same day’s flight from Shanghai to Hong KongB 5%Finding enough meat was a problem for primitive (原始的) man and, keeping it for times when it was scarce(缺乏的)was just as hard. Three ways were found to keep meat from spoiling (腐烂.) : salting ( 盐) , drying, and freezing.People near salty waters salted their meat. At first they probably put dry salt on it, but this kept only the outside. Later they may have pickled (腌) their meat by putting it in salt water.In hot, dry places, men found that they could eat meat that had dried while it was still on the bones (骨头) .They later learned to cut meat into thin pieces and put it up to dry in the hot air.Men in cold places found that frozen (结冰的) meat didn't spoil. They could leave their meat outside and eat it when they pleased.1. Some people learned that could pickle meat by _____.A. putting dry salt on itB. soaking it in salt waterC. cooking it with saltD. cutting it into pieces2. The people in the desert(沙漠) learned to dry meat by _____.A. putting it up in the hot airB. leaving the animals where they were killedC. putting it over their firesD. leaving the meat on the bones3. The ways to keep meat from spoiling depended on ______.A. how much meat had to be keptB. where the people livedC. how long the meat had to be keptD. Both B and C4. It seems true that _____.A. freezing was the easiest way to keep meatB. pickling was the best way to keep meatC. dried meat stayed fresh(新鲜) the longestD. none of these was a good way to keep meat5. The best tide for this selection(选段) is ______.A. How To Pickle MeatB. Finding Enough MeatC. Primitive Man 'D. Man Learns To Preserve('保管)MeatC. 10%Advertisements(广告)1.Look at Advertisement 1.The Browns are looking for a new house. Mr Brown wants to live in the centre of town near his work. Mrs Brown wants a house with four bedrooms. Their children don't care what the house is like as long as(只要)the garden is big enough.Why didn’t the Browns buy the house in the advertisement?A.It was on the wrong side of town.B.There weren't enough bedrooms.C.There was no dining room..D.The garden was too big.2. Look at Advertisement 2.Ann has always wanted to work in a restaurant. She thinks they're exciting places. It's hard work but she isn't lazy(懒).You have to work on Saturdays and Sundays but you get other days off. It's not very well-paid, but who cares about money?Why does Ann want to get the job in the restaurant?A. It's an easy job.B. The pay is good and the food is free.C. She thinks it would be fun.D. You get long holidays.3. Look at Advertisement 3.Tom: There's a new football team standing in the village, Mum. I'm old enough to play in it. We stop school at half past three, so I'd have plenty of time.Mum: Well, 1 suppose you could do your homework later. But look, Tom, you haven't read the advertisement carefully. You can't possibly play for this team.Why can't Tom play for the new football team?A. He's not old enough.B. It's in a different village.C. School stops too late.D. He has to do his homework.4. Look at Advertisement 4.Man: I'm looking for a room to rent(租).It doesn't matter how big it is. I don't care what colour the walls are or how old the furniture(家具)is. I've got to study for my exams, so the house must be quiet.Girl:There are some advertisements for rooms in the paper. What about this one?Man: Yes... Yes... that's all right. Oh dear, no, I don't think it would do.What's wrong with the room in Advertisement 4?A. It's too small.B. The walls are the wrong colour.C. The man likes old furniture better.D. It's too noisy.5. Look at Advertisements 5 and6.Man: Why don't we rent one of the sea view holiday flats for our holiday,Mary? They sound just as good as the sea view hotel, and it would be much cheaper.Mary: There's one big difference between the holiday flats and the hotel. The hotel would be much less work!Why would Mary rather stay at the hotel?A. They wouldn't have to cook.B. It's not so expensiveC. She would enjoy the beautiful gardens.D. It's nearer the sea.IV. 词汇(5%)(A).根据汉语写单词1. ________(挑战) and change always come together.2. They want to go on a long ________ (旅行) to the west of China.3. Dumpling is the most ________ (传统) food in the Spring Festival.4. Mr Zhang ________ (毕业) from Beijing University in 1985.5. He told us that he encouraged lcis son to take part in the writing _______(竞赛).(B).根据首字母填空1. Do you often take part in your school a________?2. Alice is alway too s________ to talk in public.3. He used not to like peking Opera ,but now he is very f________ of it .4. The bus went around to p________ up students every morning.5. “WWW” means “W________ Wide Web”.V.补全对话10%Guide:Excuse me. 1 ?Tourist: Yes. And you are... ?Guide: 2 Beijing China Travel Service. This is my membership card._ 3 ? Tourist: OK. Here you are. Guide: Welcome to Beijing. Miss Caroline. I am so glad that the first one I asked is the guest I will receive. Tourist: Thank you, Miss Chen. Iam so lucky that I can meet my guide 4 .Guide; Let me help you with your luggage. Our car is waiting for us just at the entrance. 5 .Tourist: Thank you very much for your excellent service. Guide: With great pleasure.1. A. Who are youB. Are you Miss Caroline from Los AngelesC. Do you come from Los AngelesD. Are you from Los Angeles2. A. I'm an English guide from B. I fromC. I'm a waiter fromD. I'm a waitress from3. A. Do you have a passportB. Can you give me your passportC. Would you please show me your passportD. Please give me your passport4. A. as soon as I got off the plane B. at the railway stationC. in the airportD. on the airport5. A. Let's go B. Come alongC. Come onD. The car will lake us right to the hotelVI.作文15%下面有三个话题,请你任选一个话题按要求写一篇短文。
成都七中2021年自主招生考试-选择解析6 成都七中 2021 年自主招生考试-选择题数学(解析版-By:杰少)一、选择题(每小题只有一个正确答案,每小题 5 分,共 60 分)1.若 M = 5x 2-12 xy +10 y 2- 6x - 4 y +13 ( x 、y 为实数),则 M 的值一定为( )A.非负数B.负数C.正数D.零【答案】A【解析】M =(2x -3y )2+(x -3)2+(y -2)2≥0,当 x =3,y =2 取等.2.将一个棱长为 m ( m > 2 且 m 为正整数)的正方体木块的表面染上红色,然后切成m 3个棱长为1 的小正方体,发现只有一个表面染有红色的小正方体的数量是恰有两个表面染有红色的小正方体的数量的12 倍,则m 等于( ) A.16B.18C. 26D. 32【答案】C【解析】6(m -2)2=12×12(m -2),∴m =26.3.已知6a 2 -100 a + 7 = 0,7b 2-100 b + 6 = 0 ,且ab ≠ 1 ,则 a 的值为( )bA. 50B. 6D. 7 3 7 7 6【答案】D【解析】a ,1是方程 6x 2-100x +7=0 的两根,∴.b4.若a = , b = 2 + - a ,则的值为( )bA. 1B. 1C.1 D.1 24【答案】B 2 + 36 + 10【解析】,相乘平方差.5.满足 ab + a - b - 1 = 0 的整数对(a , b )共有( ) A. 4 个B. 5 个C. 6 个D. 7 个【答案】C【解析】|ab |+|a -b |=1,∴,或,有 6 组解.32 +106.在凸四边形 ABCD 中,E 为 BC 边的中点,BD 与 AE 相交于点O ,且 BO =DO ,AO = 2EO ,则 S ?ACD : S ?ABD 的值为( )A.2:5B.1:3C.2:3D.1:2【答案】D【解析】OE ∥CD ,∴S =S =2S =2S =S=1S,∴S △ACD :S △ABD=1:2△ACD △DOC △BDC △BOE △ABD2△ABD7.从 1 到 2019 连续自然数的平方和12 + 22 + 32 ++ 20192 的个位数字是( )A.0B.1C.5D.9【答案】A 【解析】i (i +1)(2i +1),当 n =2019 时,显然尾数为 0.68.已知 x + y + z = 0 ,且 1+ x + 1 1y + 2 1 z + 3= 0 ,则代数式(x + 1)2 + ( y + 2)2 + (z + 3)2 的值为 () A.3B.14C.16D.36【答案】D【解析】此题我相信张涛老师应该还有印象吧,我第一次在群里接触他时,我们就讨论过类似的题,我说这种题可以直接口算秒杀:(x +1)+(y +2)+(z +3)=6,∴ (x +1)2+(y +2)2+(z +3)2=62=36.9.将一枚六个面编号为1、2、3、4、5、6 的质地均匀的正方体骰子先后投两次,记第一次投ax + by = 2掷的点数为 a ,第二次投掷出的点数为 b ,则使关于 x 、y 的方程组?2x + y = 3,只有正数解的概率为()A. 112【答案】BB. 16C. 518D. 1336【解析】仅 a =1,b =1,2,3,4,5,6,满足题意.总共6×6=36 种情况,∴P = 6361. 610.方程3a 2 - 8a - 3b - 1 = 0 ,当 a 取遍 0 到 5 的所有实数值时,则满足方程的整数 B 的个数是() A.12 个B.13 个C.14 个D.15 个【答案】C【解析】3b =3a 2-8a -1,0≤a ≤5,∴,∴count (b )=(11+2)+1=14.11.若一个三角形的三边和为40,且各边长均为整数,则符合条件的三角形的个数为( )A.31 个B.32 个C.33 个D.34 个【答案】C【解析】不妨设a≤b≤c,则40=a+b+c≤3c,∴c≥14.40=a+b+c>c+c,∴c<20,∴c≤19.∴14≤c≤19.再简单讨论a,b 即可,总共33 种情况.12.若关于x的方程x2 +ax+b-3=0有实根,则a2 +(b-4)2 的最小值为( )A.0B.1C.4D.9【答案】B【解析】注意Δ=a2-4(b-3)≥0,a2+(b-4)2≥(b-2)2≥1,当a=0,b=3 取等号.注意,此题容易错选A,显然a=0,b=2 不可能同时成立,a2 取最小的4(b-3) 时,有4(b-3)≥0 得到b≥3.。
成都七中初升高自主招生考试试题数学试题卷I (选择题,共36分)一.选择题:本大题共12个小题,每小题3分,共36分.在每小题给出的四个选项中,只有一项是符合题目要求的.1.计算3×(-2) 的结果是( )A .5B .-5C .6D .-62.如图1,在△ABC 中,D 是BC 延长线上一点, ∠B = 40°,∠ACD = 120°,则∠A 等于( ) A .60° B .70°C .80°D .90°3.下列计算中,正确的是( )A .020=B . 623)(a a = C .93=± D .2a a a =+4.如图2,在□ABCD 中,AC 平分∠DAB ,AB = 3, 则□ABCD 的周长为( ) A .6 B .9 C .12D .155.把不等式2x -< 4的解集表示在数轴上,正确的是( )2011年成都石室中学实验学校自主招生考试试题理化试题(考试时间120分钟,满分200分)可能用到的相对原子质量:H 1 C 12 N 14 O 16 Fe 56 Cu 64第Ⅰ卷(选择题,共81分)一、选择题(每小题3分,共66分。
每小题只有一个选项是最符合题目要求的) 1. 我市正在推广“LED ”绿色节能光源。
砷化镓(GaAs )是光源材料,Ga 为+3价,As 的化合价为( ) A . +3 B. ﹣3 C. +5 D. ﹣5 2. 下列物品属于有机合成材料的是( )A. 导电塑料B. 铝制电缆C. 越王勾践青铜剑D. 羊毛绒纺织品 3. 化学与人们的生活紧密相连,用所学化学知识判断,下列做法或说法错误..的是( ) A. 天然气、瓦斯等气体和面粉、煤粉等固体粉尘都易发生爆炸 B. 多吃水果蔬菜可以补充维生素,过多摄入微量元素不利健康C. 将自行车擦干净,并将其链条、钢圈等构件抹上油,可有效防止生锈D. 利用洗涤剂的乳化功能,可将白衬衣上的蓝墨水渍迅速洗掉4. 氯化钴(CoCl 2)晶体因含结晶水数目不同而呈现不同的颜色,故可作硅胶干燥剂的指示剂和隐形ABCD图2ABCD 40°120°图1墨水。
成都七中-物理试卷A卷(共100分)第I卷(选择题,共30分)一.选择题(每小题2分,共分30分)1.关于粒子和宇宙,下列认识中正确的是()A.分子间只存在引力不存在斥力B.面包可以被捏扁说明分子间有空隙C.美味佳肴香气扑鼻说明分子不停地做无规则运动D.银河系、地球、原子核、分子是按照尺度由大到小的顺序排列的2.关于温度、内能和热量,下列说法正确的是()A.0℃的物体没有内能B.物体的机械能越多,内能就越多C.物体内能增加,一定是从外界吸收了热量D.物体温度升高,内能增大3.四冲程柴油机在工作过程中,将内能转化为机械能的冲程是()A.吸气冲程B.压缩冲程C.做功冲程D.排气冲程4.如图所示,两个相同的验电器A和B,A带正电,B不带电,用带有绝缘柄的金属棒把A和B连接起来,下列说法不正确的是()A.A金属箔张角变小,说明它得到电子B.B金属箔张角变大,说明两金属箔带上同种电荷C.自由电子从B向A定向移动,形成瞬间电流D.正电荷从A向B定向移动,形成瞬间电流5.下列说法中完全正确的是()A.电路中只要有电源,一定有电流B.在电源内部,电流的方向也是从电源正极流向负极的C.当给手机电池充电时,手机电池是用电器D.发光二极管接入电路中时,如果不发光,一定发光二极管坏了6.关于电现象,下列说法正确的是()A.摩擦起电是创造了新的电荷B.只有正电荷定向移动才能形成电流C.与丝绸摩擦过的玻璃棒带正电是因为它得到电子D.验电器的工作原理是同种电荷相互排斥7.下列数据符合实际的是()A.家庭电路的工作电压为36VB.家用小挂式空调的电流约为5AC.水的比热容为4.2J/(kg•℃)D.新型火箭发动机的效率可以达到100%8.下列电路正确的是()A. B. C. D.9.有一款“空调扇”既能送常温风,又能送凉风。
小明了解到其内部有两个电动机,其中电动机M1,驱动扇叶送风,M2驱动机内水循环使所送的风成为“凉风”,此款风扇不会只有水循环而不送风。
四川省成都七中自主招生数学试卷副标题一、选择题(本大题共12小题,共60.0分)1.已知二次函数y=ax2+bx+c(a≠0)的图象如图所示,则下列结论①a+b+c<0;②a-b+c<0;③b+2a<0;④abc>0,其中正确的个数是()A. 1个B. 2个C. 3个D. 4个2.如图,O是线段BC的中点,A、D、C到O点的距离相等.若∠ABC=30°,则∠ADC的度数是()A. 30°B. 60°C. 120°D. 150°3.如图,△ACB内接于⊙O,D为弧BC的中点,ED切⊙O于D,与AB的延长线相交于E,若AC=2,AB=6,ED+EB=6,那么AD=()A. 2B. 4C. 6D. 84.(课改)现有A、B两枚均匀的小立方体(立方体的每个面上分别标有数字1,2,3,4,5,6).用小莉掷A立方体朝上的数字为x小明掷B立方体朝上的数字为y 来确定点P(x,y),那么它们各掷一次所确定的点P落在已知抛物线y=-x2+4x上的概率为()A. 118B. 112C. 19D. 165.不等式组{48x−3≥−15x−3<−1的所有整数解的和是()A. -1B. 0C. 1D. 26.如果自然数a是一个完全平方数,那么与a之差最小且比a大的一个完全平方数是()A. a+1B. a2+1C. a2+2a+1D. a+2√a+17.如图,若将左图正方形剪成四块,恰能拼成右图的矩形,设a=1,则这个正方形的面积为()A. 7+3√52B. 3+√52C. √5+12D. (1+√2)28.对于两个数,M=2008×20 092 009,N=2009×20 082 008.则()A. M=NB. M>NC. M<ND. 无法确定9.如图,已知∠A=∠B,AA1,PP1,BB1均垂直于A1B1,AA1=17,PP1=16,BB1=20,A1B1=12,则AP+PB等于()A. 12B. 13C. 14D. 1510.若实数abc满足a2+b2+c2=9,代数式(a-b)2+(b-c)2+(c-a)2的最大值是()A. 27B. 18C. 15D. 1211.成都七中学生网站是由成都七中四大学生组织共同管理的网站,该网站是成都七中历史上首次由四大学生组织共同合作建成的一个学生网站,其内容囊括了成都七中学生学习及生活的各个方面.某学生在输入网址“http:∥www.cdqzstu.com”中的“cdqzstu.com”时,不小心调换了两个字母的位置,则可能出现的错误种数是()A. 90B. 45C. 88D. 4412.已知四边形ABCD,从下列条件中:(1)AB∥CD;(2)BC∥AD;(3)AB=CD;(4)BC=AD;(5)∠A=∠C;(6)∠B=∠D.任取其中两个,可以得出“四边形ABCD是平行四边形”这一结论的情况有()A. 4种B. 9种C. 13种D. 15种二、填空题(本大题共4小题,共16.0分)13.判断一个整数能否被7整除,只需看去掉一节尾(这个数的末位数字)后所得到的数与此一节尾的5倍的和能否被7整除.如果这个和能被7整除,则原数就能被7整除.如126,去掉6后得12,12+6×5=42,42能被7整除,则126能被7整除.类似地,还可通过看去掉该数的一节尾后与此一节尾的n倍的差能否被7整除来判断,则n= ______ (n是整数,且1≤n<7).14.假期学校组织360名师生外出旅游,某客车出租公司有两种大客车可供选择:甲种客车每辆车有40个座,租金400元;乙种客车每辆车有50个座,租金480元.则租用该公司客车最少需用租金______ 元.15.如果关于x的一元二次方程2x2-2x+3m-1=0有两个实数根x1,x2,且它们满足不等式x1x2x1+x2−3<1,则实数m的取值范围是______ .16. 黑、白两种颜色的正六边形地砖按如图所示的规律拼成若干个图案:则第n 个图案中有白色地砖______块.(用含n 的代数式表示)三、解答题(本大题共6小题,共24.0分)17. (1)先化简,再求值:5(x 2-2)-2(2x 2+4),其中x =-2;(2)求直线y =2x +1与抛物线y =3x 2+3x -1的交点坐标.18. 如图,⊙O 与直线PC 相切于点C ,直径AB ∥PC ,PA 交⊙O 于D ,BP 交⊙O 于E ,DE 交PC 于F .(1)求证:PF 2=EF •FD ;(2)当tan ∠APB =12,tan ∠ABE =13,AP =√2时,求PF 的长;(3)在(2)条件下,连接BD ,判断△ADB 是什么三角形?并证明你的结论.19. 已知:如图,直线y =−34x +3交x 轴于O 1,交y 轴于O 2,⊙O 2与x 轴相切于O点,交直线O 1O 2于P 点,以O 1为圆心,O 1P 为半径的圆交x 轴于A 、B 两点,PB 交⊙O 2于点F ,⊙O 1的弦BE =BO ,EF 的延长线交AB 于D ,连接PA 、PO . (1)求证:∠APO =∠BPO ; (2)求证:EF 是⊙O 2的切线;(3)EO 1的延长线交⊙O 1于C 点,若G 为BC 上一动点,以O 1G 为直径作⊙O 3交O1C于点M,交O1B于N.下列结论:①O1M•O1N为定值;②线段MN的长度不变.只有一个是正确的,请你判断出正确的结论,并证明正确的结论,以及求出它的值.20.如图,五边形ABCDE为一块土地的示意图.四边形AFDE为矩形,AE=130米,ED=100米,BC截∠F交AF、FD分别于点B、C,且BF=FC=10米.(1)现要在此土地上划出一块矩形土地NPME作为安置区,且点P在线段BC上,若设PM的长为x米,矩形NPME的面积为y平方米,求y与x的函数关系式,并求当x为何值时,安置区的面积y最大,最大面积为多少?(2)因三峡库区移民的需要,现要在此最大面积的安置区内安置30户移民农户,每户建房占地100平方米,政府给予每户4万元补助,安置区内除建房外的其余部分每平方米政府投入100元作为基础建设费,在五边形ABCDE这块土地上,除安置区外的部分每平方米政府投入200元作为设施施工费.为减轻政府的财政压力,决定鼓励一批非安置户到此安置区内建房,每户建房占地120平方米,但每户非安置户应向政府交纳土地使用费3万元.为保护环境,建房总面积不得超过安置区面积的50%.若除非安置户交纳的土地使用费外,政府另外投入资金150万元,请问能否将这30户移民农户全部安置?并说明理由.21.如图,已知O为坐标原点,∠AOB=30°,∠ABO=90°,且点A的坐标为(2,0).(1)求点B的坐标;(2)若二次函数y=ax2+bx+c的图象经过A、B、O三点,求此二次函数的解析式;(3)在(2)中的二次函数图象的OB段(不包括点O、B)上,是否存在一点C,使得四边形ABCO的面积最大?若存在,求出这个最大值及此时点C的坐标;若不存在,请说明理由.22.数独(sūdoku)是一种源自18世纪末的瑞士,后在美国发展、并在日本发扬光大的数学智力拼图游戏.拼图是九宫格(即3格宽×3格高)的正方形状,每一格又细分为一个九宫格.在每一个小九宫格中,分别填上1至9的数字,让整个大九宫格每一列、每一行的数字都不重复.下面是一个数独游戏,请完成该游戏.(您只需要完整地填出其中的5个小九宫格即可)(评分标准:完整地填出其中的5个小九宫格且5个均正确即可给满分.未填出5个不给分.若填出超过5个且无错给满分,若填出超过5个且有任何一处错误不给分.)答案和解析1.【答案】B【解析】解:∵抛物线的开口方向向下,∴a<0,∵抛物线与y轴的交点为在y轴的正半轴上,∴c>0,∵抛物线对称轴在y轴右侧,∴对称轴为x=>0,又∵a<0,∴b>0,故abc<0;由图象可知:对称轴为x=<1,a<0,∴-b>2a,∴b+2a<0,由图象可知:当x=1时y>0,∴a+b+c>0;当x=-1时y<0,∴a-b+c<0.∴②、③正确.故选B.由抛物线的开口方向判断a与0的关系,由抛物线与y轴的交点判断c与0的关系,然后根据对称轴及抛物线与x轴交点情况进行推理,进而对所得结论进行判断.考查二次函数y=ax2+bx+c系数符号的确定.2.【答案】D【解析】解:∵四边形ABCD内接于⊙O,∴∠ADC+∠ABC=180°,即∠ADC=150°.故选D.根据圆内接四边形的性质即可求出∠ADC的度数.本题考查的是圆内接四边形的性质:圆内接四边形的对角互补.3.【答案】B【解析】解:设AD与BC交于点F∵ED+EB=6∴DE2=BE•AE=BE(BE+AB)=BE2+BE•AB∴(DE+BE)(DE-BE)=BE•AB即6×(DE-BE)=BE×6∴DE=2BE∵DE2=BE2+BE•AB∴BE=2,DE=4连接BD,则∠EDB=∠EAD∵D为弧BC的中点∴∠DAC=∠BAD∴∠CBD=∠BDE∴BC∥DE∴BF:DE=AB:AE∴BF=3∵AD是∠BAC的平分线∴AB:BF=AC:CF∴CF=1∴BC=BF+CF=4∴BF•CF=AF•DF=3∵BF:ED=AF:AD=AF:(AF+DF)∴DF=1,AF=3∴AD=AF+DF=4.设AD与BC交于点F,由切线长定理知DE2=BE•AE=BE(BE+AB)=BE2+BE•AB,可求得DE=2BE.利用DE2=BE2+BE•AB求得,BE=2,DE=4,连接BD,由弦切角的性质知,∠EDB=∠EAD,得到BF:DE=AB:AE作为相等关系可求出BF=3,根据AD是∠BAC的平分线,由角的平分线定理得,AB:BF=AC:CF,由相交弦定理得,BF•CF=AF•DF=3,所以可求出DF=1,AF=3,从而求得AD的值.本题利用了切割线定理,切线长定理,弦切角的性质,圆周角定理,角的平分线定理,相交弦定理,平行线的判定和性质求解,综合性比较强.4.【答案】B【解析】解:点P的坐标共有36种可能,其中能落在抛物线y=-x2+4x上的共有(1,3)、(2,4)、(3,3)3种可能,其概率为.故选:B.因为掷骰子的概率一样,每次都有六种可能性,因此小莉和小明掷骰子各六次,P的取值有36种.可将x、y值一一代入找出满足抛物线的x、y,用满足条件的个数除以总的个数即可得出概率.本题综合考查函数图象上点的坐标特征与概率的确定.5.【答案】C【解析】解:由不等式①得由不等式②得x<2所以不等组的解集为不等式的整数解0,1,则所有整数解的和是1.故选C.首先解不等式组,再从不等式组的解集中找出适合条件的整数即可.正确解出不等式的解集是解决本题的关键.求不等式组的解集,应遵循以下原则:同大取较大,同小取较小,小大大小中间找,大大小小解不了.6.【答案】D【解析】解:∵自然数a是一个完全平方数,∴a的算术平方根是,∴比a的算术平方根大1的数是+1,∴这个平方数为:(+1)2=a+2+1.故选:D.当两个完全平方数是自然数时,其算术平方根是连续的话,这两个完全平方数的差最小.解此题的关键是能找出与a之差最小且比a大的一个完全平方数是紧挨着自然数后面的自然数:+1的平方.7.【答案】A【解析】解:根据图形和题意可得:(a+b)2=b(a+2b),其中a=1,则方程是(1+b)2=b(1+2b)解得:b=,所以正方形的面积为(1+)2=.故选A.从图中可以看出,正方形的边长=a+b,所以面积=(a+b)2,矩形的长和宽分别是a+2b,b,面积=b(a+2b),两图形面积相等,列出方程得=(a+b)2=b(a+2b),其中a=1,求b的值,即可求得正方形的面积.本题的关键是从两图形中,找到两图形的边长的值,然后利用面积相等列出等式求方程,解得b的值,从而求出边长,求面积.8.【答案】A【解析】解:根据数的分成和乘法分配律,可得M=2008×(20 090 000+2009)=2008×20 090 000+2008×2009=2008×2009×10000+2008×2009=2009×20 080 000+2008×2009,N=2009×(20 080 000+2008)=2009×20 080 000+2009×2008,所以M=N.故选:A.根据有理数大小比较的方法,以及乘法分配律可解.熟练运用乘法分配律进行数的计算,然后比较各部分即可.9.【答案】B【解析】解:如图,AA1,PP1,BB1均垂直于A1B1,∴AA1∥PP1∥BB1,过点P作PF⊥AA1,交AA1于点D,交BB1于点F,延长BP交AA1于点C,作CG⊥BB1,交BB1于点G,∴四边形DFB1A1,DPP1A1,FPP1B1,FDGC,CGB1A1是矩形,∴DA1=PP1=FB1=16,CG=A1B1=12,∵AA1∥BB1,∴∠B=∠ACB,∵∠A=∠B∴∠A=∠BCA,∴AP=CP,∵PF⊥AA1,∴点D是AC的中点,∵AA1=17,∴AD=CD=17-16=1,BF=20-16=4,FG=CD=1,BG=4+1=5,∴BP+PA=BP+PC=BC===13.故选B.如图,AA1,PP1,BB1均垂直于A1B1,过点P作PF⊥AA1,交AA1于点D,交BB1于点F,延长BP交AA1于点C,作CG⊥BB1,交BB1于点G,然后根据矩形和直角三角形的性质求解.本题通过作辅助线,构造矩形和直角三角形,利用矩形和直角三角形的性质和勾股定理求解.10.【答案】A【解析】解:∵a2+b2+c2=(a+b+c)2-2ab-2ac-2bc,∴-2ab-2ac-2bc=a2+b2+c2-(a+b+c)2①∵(a-b)2+(b-c)2+(c-a)2=2a2+2b2+2c2-2ab-2ac-2bc;又(a-b)2+(b-c)2+(c-a)2=3a2+3b2+3c2-(a+b+c)2=3(a2+b2+c2)-(a+b+c)2②①代入②,得3(a2+b2+c2)-(a+b+c)2=3×9-(a+b+c)2=27-(a+b+c)2,∵(a+b+c)2≥0,∴其值最小为0,故原式最大值为27.故选A.根据不等式的基本性质判断.本题主要考查了不等式a2+b2≥2ab.11.【答案】D【解析】解:“cdqzstu.com”中共有10个字母;若c与后面的字母分别调换,则有:10-1=9种调换方法;依此类推,调换方法共有:9+8+7+…+1=45种;由于10个字母中,有两个字母相同,因此当相同字母调换时,不会出现错误.因此出现错误的种数应该是:45-1=44种.故选D.“cdqzstu.com”中字母有10个.相同字母有2个.若第一个错误的字母是第一个字母c,那么c和它后面除c外任何一个字母调换后都可能出现错误,则错误的种类可能有8种.若第1个错误的字母是第二个字母d,排除和第一个字母已经计算过的错误后,可能出现的错误应该有8种,按照此种方法,错误的种类依次为:7,6,5,4,3,2,1;共有:16+7+6+5+4+3+2+1=44种.解答本题时需注意:相同字母调换后结果不会出现错误.12.【答案】B【解析】解:根据平行四边形的判定,符合四边形ABCD是平行四边形条件的有九种:(1)(2);(3)(4);(5)(6);(1)(3);(2)(4);(1)(5);(1)(6);(2)(5);(2)(6)共九种.故选B.平行四边形的五种判定方法分别是:(1)两组对边分别平行的四边形是平行四边形;(2)两组对边分别相等的四边形是平行四边形;(3)一组对边平行且相等的四边形是平行四边形;(4)两组对角分别相等的四边形是平行四边形;(5)对角线互相平分的四边形是平行四边形.根据平行四边形的判定,任取两个进行推理.平行四边形的判定方法共有五种,应用时要认真领会它们之间的联系与区别,同时要根据条件合理、灵活地选择方法.13.【答案】2【解析】解:∵和的时候,是尾数的5倍,能被7整除,任意一个正整数写成P=10a+b,b是P的个位数.根据已知结论,P是7的倍数等价于a+5b是7的倍数,而a+5b=a-2b+7b,a+5b和a-2b相差7的倍数,所以它们两个同时是7的倍数或者同时不是7的倍数.因此n=2符合要求.∴差的时候,应是尾数的2倍,∴n=2.故填2.根据题意,知方法一是去掉一节尾(这个数的末位数字)后所得到的数与此一节尾的5倍的和能否被7整除.所以若改为求差,则应是尾数的2倍.因为要能够被7整除,根据方法一,即可看出和的时候,是尾数的5倍,则差的时候,应是尾数的2倍.14.【答案】3520【解析】解:若只租甲种客车需要360÷40=9辆.若只租乙种客车需要8辆,因而两种客车用共租8辆.设甲车有x辆,乙车有8-x辆,则40x+50(8-x)≥360,解得:x≤4,整数解为0、1、2、3、4.汽车的租金W=400x+480(8-x)即W=-80x+3840W的值随x的增大而减小,因而当x=4时,W最小.故取x=4,W的最小值是3520元.故答案为:3520.若只租甲种客车需要360÷40=9辆.若只租乙种客车需要8辆,但有一辆不能坐满.只租甲种客车正好坐满,这种方式一定最贵.因而两种客车用共租8辆.两种客车的载客量大于360,根据这个不等关系,就可以求出两种客车各自的数量,进而求出租金.本题是一次函数与不等式相结合的问题,能够通过条件得到两种客车共租8辆,是解决本题的关键.15.【答案】-1<m≤12【解析】解:根据一元二次方程根与系数的关系知,x1+x2=1,x1•x2=,代入不等式得<1,解得m>-1,又∵方程有两个实数根,∴△=b2-4ac≥0,即(-2)2-4×2×(3m-1)≥0,解得m≤,综合以上可知实数m的取值范围是-1<m≤.故本题答案为:-1<m≤.把两根之和与两根之积代入已知条件中,求得m的取值范围,再根据根的判别式求得m的取值范围.最后综合情况,求得m的取值范围.一元二次方程根与系数的关系为,x1+x2=-,x1•x2=,将根与系数的关系与代数式变形相结合解题是一种经常使用的解题方法.16.【答案】4n+2【解析】解:分析可得:第1个图案中有白色地砖4×1+2=6块.第2个图案中有白色地砖4×2+2=10块.…第n个图案中有白色地砖4n+2块.通过观察,前三个图案中白色地砖的块数分别为:6,10,14,所以会发现后面的图案比它前面的图案多4块白色地砖,可得第n个图案有4n+2块白色地砖.本题考查学生通过观察、归纳的能力.此题属于规律性题目.注意由特殊到一般的分析方法,此题的规律为:第n个图案有4n+2块白色地砖.17.【答案】解:(1)5(x2-2)-2(2x2+4)=5x2-10-4x2-8=x2-18=(-2)2-18=4-18=-14(2)把y=2x+1代入y=3x2+3x-1,可得3x2+x-2=0,解得x=23或x=-1,①当x=23时,y=2×23+1=43+1=213②当x=-1时,y=2×(-1)+1=-2+1=-1所以直线y=2x+1与抛物线y=3x2+3x-1的交点坐标是(23,213)、(-1,-1).【解析】(1)首先去掉括号,再合并同类项,然后把x=-2代入,求出算式5(x2-2)-2(2x2+4)的值是多少即可.(2)把y=2x+1代入y=3x 2+3x-1,求出x 的值是多少,进而求出y 的值,确定出直线y=2x+1与抛物线y=3x 2+3x-1的交点坐标即可.(1)此题主要考查了整式的化简求值问题,解答此题的关键是注意去括号时符号的变化.(2)此题还考查了直线与抛物线的交点坐标的求法,采用代入法即可.18.【答案】解:(1)∵AB ∥PC ,∴∠BPC =∠ABE =∠ADE .又∵∠PFE =∠DFP ,△PFE ∽△DFP ,∴PF :EF =DF :PF ,PF 2=EF •FD .(2)连接AE ,∵AB 为直径,∴AE ⊥BP .∵tan ∠APB =12=AE PE ,tan ∠ABE =13=AE BE ,令AE =a ,PE =2a ,BE =3a ,AP =√5a =√2,∴a =√105=AE ,PE =25√10,BE =3√105. ∵PC 为切线,∴PC 2=PE •PB =4.∴PC =2.∵FC 2=FE •FD =PF 2∴PF =FC =PC 2=1,∴PF =1.(3)△ADB 为等腰直角三角形.∵AB 为直径,∴∠ADB =90°.∵PE •PB =PA •PD ,∴PD =2√2BD =√BP 2−PD 2=√2=AD .∴△ADB 为等腰Rt △.【解析】(1)欲证PF 2=EF•FD ,可以证明△PFE ∽△DFP 得出;(2)求PF 的长,根据∠APB 的正切,需连接AE ,求出AE ,PE ,BE 的长,再根据PC 为切线,求出PC 的长,通过相似的性质,切线的性质得出PF=FC 即可; (3)判断△ADB 是什么三角形,根据圆周角定理得出∠ADB=90°,再求出AD ,DB ,AB 的长,可以得出△ADB 为等腰Rt △.乘积的形式通常可以转化为比例的形式,通过证明三角形相似得出,同时综合考查了三角函数,三角形的判断,切线的性质等.19.【答案】解:(1)连接O2F.∵O2P=O2F,O1P=O1B,∴∠O2PF=∠O2FP,∠O1PB=∠O1BP,∴∠O2FP=∠O1BP.∴O2F∥O1B,得∠OO2F=90°,∴∠OPB=1∠OO2F=45°.2又∵AB为直径,∴∠APB=90°,∴∠APO=∠BPO=45°.(2)延长ED交⊙O1于点H,连接PE.∵BO为切线,∴BO2=BF•BP.又∵BE=BO,∴BE2=BF•BP.而∠PBE=∠EBF,∴△PBE∽△EBF,∴∠BEF=∠BPE,∴BE=BH,有AB⊥ED.又由(1)知O2F∥O1B,∴O2F⊥DE,∴EF为⊙O2的切线.(3)MN的长度不变.过N作⊙O3的直径NK,连接MK.则∠K=∠MO1N=∠EO1D,且∠NMK=∠EDO1=90°,又∵NK=O1E,∴△NKM≌△EDO1,∴MN=ED.而OO1=4,OO2=3,∴O1O2=5,∴O1A=8.即AB=16,∵EF与圆O2相切,∴O2F⊥ED,则四边形OO2FD为矩形,∴O2F=OD,又圆O2的半径O2F=3,∴OD=3,∴AD=7,BD=9.ED2=AD•BD,∴ED=3√7.故MN的长度不会发生变化,其长度为3√7.【解析】(1)可通过度数来求两角相等.连接O2F,那么∠O2PF=∠O2FP=∠OBP,因此O2F∥AB,这样可得出圆O2的圆心角∠OO2F=90°.因此∠OPF=45°,那么∠APO=90°-45°=45°,因此两角相等.(2)由于(1)中得出了O2F∥AB,因此只要证得DE⊥AB,就能得出DE⊥O2F,也就得出了DE是圆O2的切线的结论,那么关键是证明DE⊥AB.可通过垂径定理来求.延长ED交⊙O1于点H,那么就要求出DE=DH或BE=BH,那么就要先求出∠BEH=∠BHE.连接PE,那么∠BHE=∠EPB,那么证∠EPB=∠DEB即可.可通过相似三角形BEF和BPE来求得,这两个三角形中,已知了一个公共角,我们再看夹这个角的两组对边是否成比例.由于BO2=BF•BP,而BO=BE,因此BE2=BF•BP,由此可得出两三角形相似,进而可根据前面分析的步骤得出本题的结论.(3)MN的长度不变.这是因为点G是BC上的一个动点,但的O1C长度是不变的,它等于⊙的半径8,另外∠BO1C的大小也是始终不变的,因为所有的⊙O3都是等圆,故弧MGN也都是相等的,故弦MN都是相等的,求MN的长,可通过构建全等三角形来求解,过N作⊙O3的直径NK,连接MK,那么三角形NKM和EDO1全等,那么只要求出DE的长即可,根据直线的解析式,可得出O1,O2的坐标,也就求出了OO1,OO2的值,也就能得出圆O1的半径的长,进而可求出AD,BD的长然后根据DE2=AD•DB即可得出MN的值.本题主要考查了圆与圆的位置关系,全等三角形,相似三角形的判定和性质以及一次函数等知识点的综合应用.图中边和角较多,因此搞清楚图中边和角的关系是解题的关键.20.【答案】解:(1)延长MP交AF于点H,则△BHP为等腰直角三角形.BH=PH=130-xDM=HF=10-BH=10-(130-x)=x-120则y=PM•EM=x•[100-(x-120)]=-x2+220x由0≤PH≤10得120≤x≤130因为抛物线y=-x2+220x的对称轴为直线x=110,开口向下.所以,在120≤x≤130内,当x=120时,y=-x2+220x取得最大值.其最大值为y=12000(㎡)(2)设有a户非安置户到安置区内建房,政府才能将30户移民农户全部安置.由题意,得30×100+120a≤12000×50%×10×0.02≤150+3a30×4+(12000-30×100-120a)×0.01+90+1002≤a≤25解得181721因为a为整数.所以,到安置区建房的非安置户至少有19户且最多有25户时,政府才能将30户移民农户全部安置;否则,政府就不能将30户移民农户全部安置.【解析】(1)要求矩形的面积就应该知道矩形的长和宽,可以延长MP交AF于点H,用PH表示出PM和PN,然后根据矩形的面积=长×宽,得出函数关系式,然后根据PH的取值范围和函数的性质,得出面积最大值.(2)本题的不等式关系为:非安置户的建房占地面积+安置户的建房占地面积≤安置区面积×50%;安置户的补助费+安置户的基础建设费+安置户的设施施工费≤150万元+非安置户缴纳的土地使用费.以此来列出不等式,求出自变量的取值范围.本题考查了二次函数和一元一次不等式的综合应用,读清题意,找准等量关系是解题的关键.21.【答案】解:(1)在Rt△OAB中,∵∠AOB=30°,∴OB =√3,过点B 作BD 垂直于x 轴,垂足为D ,则OD =32,BD =√32, ∴点B 的坐标为(32,√32).(1分)(2)将A (2,0)、B (32,√32)、O (0,0)三点的坐标代入y =ax 2+bx +c ,得{4a +2b +c =094a +32b +c =√32c =0(2分) 解方程组,有a =−2√33,b =4√33,c =0.(3分) ∴所求二次函数解析式是y =−2√33x 2+4√33x .(4分)(3)设存在点C (x ,−2√33x 2+4√33x )(其中0<x <32),使四边形ABCO 面积最大 ∵△OAB 面积为定值,∴只要△OBC 面积最大,四边形ABCO 面积就最大.(5分)过点C 作x 轴的垂线CE ,垂足为E ,交OB 于点F ,则S △OBC =S △OCF +S △BCF =12|CF |•|OE |+12|CF |•|ED |=12|CF |•|OD |=34|CF |,(6分)而|CF |=y C -y F =−2√33x 2+4√33x -√33x =-2√33x 2+√3x , ∴S △OBC =−√32x 2+3√34x .(7分) ∴当x =34时,△OBC 面积最大,最大面积为9√332.(8分) 此时,点C 坐标为(34,5√38),四边形ABCO 的面积为25√332.(9分) 【解析】(1)在Rt △OAB 中,由∠AOB=30°可以得到OB=,过点B 作BD 垂直于x 轴,垂足为D ,利用已知条件可以求出OD ,BD ,也就求出B 的坐标;(2)根据待定系数法把A ,B ,O 三点坐标代入函数解析式中就可以求出解析式;(3)设存在点C (x ,x 2+x ),使四边形ABCO 面积最大,而△OAB 面积为定值,只要△OBC 面积最大,四边形ABCO 面积就最大.过点C 作x 轴的垂线CE ,垂足为E ,交OB 于点F ,则S △OBC =S △OCF +S △BCF =|CF|•|OE|+|CF|•|ED|=|CF|•|OD|=|CF|,而|CF|=y C-y F=x2+x-x=-x2+x,这样可以得到S△OBC =x2+x,利用二次函数就可以求出△OBC面积最大值,也可以求出C的坐标.本题考查了待定系数法求二次函数解析式、图形变换、解直角三角形、利用二次函数探究不规则图形的面积最大值重要知识点,综合性强,能力要求极高.考查学生分类讨论,数形结合的数学思想方法.22.【答案】解:【解析】根据横列、竖列和方格的限制条件排除各个点不可能的数字,并从1-9将各个可能的数字用小字体逐个写进每个空白的格子.然后再进行审查即可.本题要根据已有横列和竖列的数字来划定要填的空的数的范围,然后再逐个进行试验,直到发现某一个数字在各个横列、竖列或方格中出现的次数仅一次时,这个数字就填写正确了.然后重复上面的步骤进行填写即可.第21页,共21页。
成都七中英语试题卷(考试时间:100分钟满分:100分)I.选择题(20)1.Two days isn’t enough for me to finish the work. I need day.A.a thirdB. the thirdC. the otherD. other2.There are four and two at the .A.Johns, Marys, doctorsB. Johns, Marys, doctor’sC. John’s,Mary’s,doctor’sD. John, Mary, doctor’s3.----I’m looking forward taking a holiday in Hainan.----So am I. It’s great to be holiday there.A.for, onB. to, atC. to, onD. for, at4.Read the sentence carefully and you’ll see you’ve a verb in it.A.lostB. goneC. missedD. left5.The teacher did what she could that child.A.to helpB. helpingC. helpedD. helps6.The sharks in the sea will people.A.driveB. keepC. attackD. protect7.There a number of animals in the zoo. The number of them two thousand.A.is, areB. are, isC. is, isD. are, are8.The visitors lions meat.A.feed, onB. feed, toC. give, toD. eat, from9.“Elevator” means .A.light in British EnglishB. light in American EnglishC. lift in British EnglishD. lift in American English10.He’s never ridden the horse before, ?A.is heB. isn’t heC. has heD. hasn’t he11.You’ll like it if you on the sea.A.are surfingB. will surfC. surfedD. have surfed12.Do you know ?A.what he happenedB. what the matter is with himC. what happened to himD. what did he happened13.He asks me to use the computer.A.whyB. ifC. whetherD. what14.She for ten hours at least. It was at nine that she fell asleep last night.A.sleptB. had sleptC. has sleptD. was sleeping15.--- What would you like to eat?--- I don’t mind.--- whatever you’ve got.A. SomethingB. EverythingC. AnythingD. Nothing16.I’m sorry you told him the secret. I wish you him the secret.A.didn’t tellB. wouldn’t tellC. will not tellD. had not tell17.--- Do you mind if I smoke here? --- .A.Pardon, I doB. Yes, not at allC. No, I do mindD. I’m sorry, but I do18.The camel was blind the right eye and only ate the grass the left side.A.o n;inB.in;onC.in;atD.at;on19.Korea(朝鲜) is Asia。
英语(考试时间:100分钟满分:100分)I. 选择题(20%)1. Two days isn’t enough for me to finish the work. I need____day.A. a thirdB. the thirdC. the otherD. other2. There are four____and two____at the____.A. Johns, Marys, doctorsB. Johns, Marys, doctor’sC. John’s, Mary’s, doctor’sD. John, Mary, doctor’s3. ----I’m looking forward____taking a holiday in Hainan.----So am I. It’s great to be____holiday there.A. for, onB. to, atC. to, onD. for, at4. Read the sentence carefully and you’ll see you’ve____a verb in it.A. lostB. goneC. missedD. left5. The teacher did what she could____that child.A. to helpB. helpingC. helpedD. helps6. The sharks in the sea will ______ people.A. driveB. keepC. attackD. protect7. There ____ a number of animals in the zoo. The number of them ____ two thousand.A. is, areB. are, isC. is, isD. are, are8. The visitors ______ lions _____ meat.A. feed, onB. feed, toC. give, toD. eat, from9. “Elevator”means ______.A. light in British EnglishB. light in American EnglishC. lift in British EnglishD. lift in American English10. He’s never ridden the horse before, ______?A. is heB. isn’t heC. has heD. hasn’t he11. You’ll like it if you ______ on the sea.A. are surfingB. will surfC. surfedD. have surfed12. Do you know _______?A. what he happenedB. what the matter is with himC. what happened to himD. what did he happened13. He asks me ______ to use the computer.A. whyB. ifC. whetherD. what14. She _____ for ten hours at least. It was at nine that she fell asleep last night.A. sleptB. had sleptC. has sleptD. was sleeping15. --- What would you like to eat?--- I don’t mind. _______ --- whatever you’ve got.A. SomethingB. EverythingC. AnythingD. Nothing16. I’m sorry you told him the secret. I wish you _____ him the secret.A. didn’t tellB. wouldn’t tellC. will not tellD. had not tell17. --- Do you mind if I smoke here? --- _______.A. Pardon, I doB. Yes, not at allC. No, I do mindD. I’m sorry, but I do18. The camel was blind _____ the right eye and only ate the grass _____ the leftside.A.on;inB.in;onC.in;atD.at;on19. Korea(朝鲜) is _____ Asia. It's _____ the northeast of China and _____ thewest of Japan.A. in; to; onB. in; on; toC. on; in; toD. to; on; in20. A stone hit _____ and he fell down on the ground.A. at Tom's headB. on Tom's headC.Tom on the headD.Tom at the headII. 完型填空30%A.In one way of thinking. failure is part of life. In 1 way, failuremay be a way towards success. The “Spider-story”is often2 .Robert Bruce , leader of the Scots in the 13 th century, was hiding ina cave from the English. He watched a spider 3 a web. The spider tried to reach across a rough 4 in the rock. He tried six times. On the 5 time he made it and went on to make his web. Bruce is said to have been encouraged by this and to have gone on to 6 the English . Edison , the inventor of the light bulb, made7 models that failed before he found the right way to make one. Once he was asked 8 he kept on trying to make a new type of battery when he had failed so often, he replied, “Failure? I have 9 failure. Now I know 50,000 ways it won't 10 ”.So what? First,always think about your failure. What caused 11 ?Were conditions right? Were you in top from yourself? What can you change? So things will go 12 next time.Second, is the goal you're trying to reach the right one? Try to do some 13 about what your real goals may be. Think about this question. “If I do succeed in this, where will it get me?" This may help you prevent failure in things you shouldn't be doing any way.The third thing to keep in 14 about failure is that it's a part of life. Learn to “live with yourself" even though you may have 15 .1. A. other B. another C. first D. second 2.A. told B. said C. talked D. spoken 3. A. doing B. taking C. making D. playing 4.A. room B. house C. place D. soil5. A. tenth B. sixth C. eighth D. seventh 6.A. save B. help C. defeat D. kill 7.A. hundred B. hundreds C. hundred of D. hundreds of8. A. why B. when C. what D. who9. A. not B. no C. never D. nothing 10.A. do B. make C. took D. work 11. A. one B. it C. that D. this 12.A. high B. large C. right D. bright 13.A. Thinking B. shopping C. reading D. cleaning14. A. heart B. eyes C. ears D. mind15. A. failed. B. succeeded C. finished D. passedB.A schoolboy’s life is in preparation for the real battle of life. It is also 1 of differences and interests. One of the 2 importantparts of a schoolboy’s life is to get 3 knowledge and good mind-training as he can . His 4 business in school is to learn. He 5 to read the book he is 6 in the classes. He has to do the homework set to him. Another part that forms a schoolboy's life is the school discipline(纪律).At school there are7 rules 8 .This strict discipline is very 9 for him when he 10 the society to 11 a living. It teaches him some very necessary virtues(美德)on the road to a 12 life.School is a place for a schoolboy to learn what the social life is 13 .For in the classroom and the playground, he has to mix with his fellows and not members of his family.He cannot behave(表现)as he does in his home. He is no longer a spoilt(宠坏的)child, and his school fellows will not give 14 to his wishes. He soon gets his corners robbed of and learns the lesson of giv-and-take, good manners, and thought for 15 .This is also the way when he has to carry himself in society.1. A. full B. fond C. sure D. short2. A. larger B. greater C. most D. different3. A. many as B. little C. as much D. more4. A. mostly B. main C. almost D. partly5. A. has B. likes C. requires D. obliges6. A. learned B. studied C. examined D. taught7. A. hard B. strict C. loose D. kind8. A. kept B. being kept C. keeping D. to be kept9. A. useful B. harmful C. bad D. pleasant10. A. enters B. leaves C. comes D. organizes11. A. produce B. make C. get D. take12. A. successful B. rich C. poor D. famous13. A. like B. on C. up D. for14. A. in B. up C. off D. out15. A. himself B. teachers C. others D. his parentsIII. 阅读理解: 20% 最后一文2分1题A 5%New Schedules of Cathy Pacific Airways1. The above is a _______.A. pictureB. piece of newsC. tableD. schedule2. It gives information to people who are going between Shanghai and Hong Kong or Beijing and Hong Kong ___.A. by carB. by trainC. by airD. by sea3. There are _____ flights from Shanghai to Hong Kong every week.A. threeB. fourC. fiveD. six4. There are _____ flights between Hong Kong and Beijing each week.A. threeB. fourC. fiveD. six5. Suppose, on arriving in Shanghai by Cathy Pacific on Thursday, you’re told to return to Hong Kong by Cathy Pacific Airways at once. Nowthe most proper way is _____.A. to wait until SaturdayB. to stay in Shanghai and take the Friday’s flight from Beijing toHong KongC. to go to Beijing and take the Friday’s flightD. to take the same day’s flight from Shanghai to Hong KongB 5%Finding enough meat was a problem for primitive (原始的) man and, keeping it for times when it was scarce(缺乏的)was just as hard. Three ways were found to keep meat from spoiling (腐烂.) : salting ( 盐) , drying, and freezing.People near salty waters salted their meat. At first they probably put dry salt on it, but this kept only the outside. Later they may have pickled (腌) their meat by putting it in salt water.In hot, dry places, men found that they could eat meat that had dried while it was still on the bones (骨头) .They later learned to cut meat into thin pieces and put it up to dry in the hot air.Men in cold places found that frozen (结冰的) meat didn't spoil. They could leave their meat outside and eat it when they pleased.1. Some people learned that could pickle meat by _____.A. putting dry salt on itB. soaking it in salt waterC. cooking it with saltD. cutting it into pieces2. The people in the desert(沙漠) learned to dry meat by _____.A. putting it up in the hot airB. leaving the animals where they were killedC. putting it over their firesD. leaving the meat on the bones3. The ways to keep meat from spoiling depended on ______.A. how much meat had to be keptB. where the people livedC. how long the meat had to be keptD. Both B and C4. It seems true that _____.A. freezing was the easiest way to keep meatB. pickling was the best way to keep meatC. dried meat stayed fresh(新鲜) the longestD. none of these wasa good way to keep meat5. The best tide for this selection(选段) is ______.A. How To Pickle MeatB. Finding Enough MeatC. Primitive Man 'D. Man Learns To Preserve('保管)MeatC. 10% Advertisements(广告)1.Look at Advertisement 1.The Browns are looking for a new house. Mr Brown wants to live in the centre of town near his work. Mrs Brown wants a house with four bedrooms. Their children don't care what the house is like as long as(只要)the garden is big enough.Why didn’t the Browns buy the house in the advertisement?A.It was on the wrong side of town.B.There weren't enough bedrooms.C.There was no dining room..D.The garden was too big.2. Look at Advertisement 2.Ann has always wanted to work in a restaurant. She thinks they're exciting places. It's hard work but she isn't lazy(懒).You have to work on Saturdays and Sundays but you get other days off. It's not very well-paid, but who cares about money?Why does Ann want to get the job in the restaurant?A. It's an easy job.B. The pay is good and the food is free.C. She thinks it would be fun.D. You get long holidays.3. Look at Advertisement 3.Tom: There's a new football team standing in the village, Mum. I'm old enough to play in it. We stop school at half past three, so I'd have plenty of time.Mum: Well, 1 suppose you could do your homework later. But look, Tom, you haven't read the advertisement carefully. You can't possibly play for this team.Why can't Tom play for the new football team?A. He's not old enough.B. It's in a different village.C. School stops too late.D. He has to do his homework.4. Look at Advertisement 4.Man: I'm looking for a room to rent(租).It doesn't matter how big it is. I don't care what colour the walls are or how old the furniture(家具)is. I've got to study for my exams, so the house must be quiet.Girl:There are some advertisements for rooms in the paper. What about this one?Man: Yes... Yes... that's all right. Oh dear, no, I don't think it would do.What's wrong with the room in Advertisement 4?A. It's too small.B. The walls are the wrong colour.C. The man likes old furniture better.D. It's too noisy.5. Look at Advertisements 5 and6.Man: Why don't we rent one of the sea view holiday flats for our holiday, Mary? They sound just as good as the sea view hotel, and it would be much cheaper.Mary: There's one big difference between the holiday flats and the hotel. The hotel would be much less work!Why would Mary rather stay at the hotel?A. They wouldn't have to cook.B. It's not so expensiveC. She would enjoy the beautiful gardens.D. It's nearer the sea.IV. 词汇(5%)(A).根据汉语写单词1. ________(挑战) and change always come together.2. They want to go on a long ________ (旅行) to the west of China.3. Dumpling is the most ________ (传统) food in the Spring Festival.4. Mr Zhang ________ (毕业) from Beijing University in 1985.5. He told us that he encouraged lcis son to take part in the writing _______(竞赛).(B).根据首字母填空1. Do you often take part in your school a________?2. Alice is alway too s________ to talk in public.3. He used not to like peking Opera ,but now he is very f________ of it .4. The bus went around to p________ up students every morning.5. “WWW”means “W________ Wide Web”.V.补全对话10%Guide:Excuse me. 1 ?Tourist: Yes. And you are... ?Guide: 2 Beijing China Travel Service. This is my membership card._ 3 ?Tourist: OK. Here you are. Guide: Welcome to Beijing. Miss Caroline. I am so glad that the first one I asked is the guest I will receive. Tourist: Thank you, Miss Chen. I am so lucky that I can meet my guide 4 . Guide; Let me help you with your luggage. Our car is waiting for us just at the entrance. 5 .Tourist: Thank you very much for your excellent service. Guide: With great pleasure.1. A. Who are youB. Are you Miss Caroline from Los AngelesC. Do you come from Los AngelesD. Are you from Los Angeles2. A. I'm an English guide from B. I fromC. I'm a waiter fromD. I'm a waitress from3. A. Do you have a passportB. Can you give me your passportC. Would you please show me your passportD. Please give me your passport4. A. as soon as I got off the plane B. at the railway stationC. in the airportD. on the airport5. A. Let's go B. Come alongC. Come onD. The car will lake us right to the hotelVI.作文15%下面有三个话题,请你任选一个话题按要求写一篇短文。