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—1—普陀区2015学年度第二学期初三质量调研数学试卷(时间:100分钟,满分:150分)考生注意:1.本试卷含三个大题,共25题.答题时,考生务必按答题要求在答题纸规定的位置上作答,在草稿纸、本试卷上答题一律无效.2.除第一、二大题外,其余各题如无特别说明,都必须在答题纸的相应位置上写出证明或计算的主要步骤.一、选择题:(本大题共6题,每题4分,满分24分)[下列各题的四个选项中,有且只有一个选项是正确的,选择正确项的代号并填涂在答题纸的相应位置上]1.据统计,2015年上海市全年接待国际旅游入境者共80016000人次,80016000用科学记数法表示是…………………………………………………………………………………(▲)(A)6100016.8;(B)7100016.8;(C)8100016.8;(D)9100016.8.2.下列计算结果正确的是…………………………………………………………………(▲)(A)824aaa;(B)624)(aa;(C)222)(baab;(D)222)(baba.3.下列统计图中,可以直观地反映出数据变化的趋势的统计图是………………………(▲)(A)折线图;(B)扇形图;(C)条形图;(D)频数分布直方图.4.下列问题中,两个变量成正比例关系的是……………………………………………(▲)(A)等腰三角形的面积一定,它的底边与底边上的高;(B)等边三角形的面积与它的边长;(C)长方形的长确定,它的周长与宽;(D)长方形的长确定,它的面积与宽.5.如图1,已知123lll∥∥,4DE,6DF,那么下列结论正确的是…………(▲)(A):1:1BCEF;(B):1:2BCAB;(C):2:3ADCF;(D):2:3BECF.6.如果圆形纸片的直径是8cm,用它完全覆盖正六边形,那么正六边形的边长最大不能超过(▲)(A)2cm;(B)23cm;(C)4cm;(D)43cm.二、填空题:(本大题共12题,每题4分,满分48分)7.分解因式:22mbma=▲.8.方程xx2的根是▲.9.不等式组13202xx的解集是▲.10.如果关于x的方程2704xxa有两个相等的实数根,那么a的值等于▲.11.函数14xyx的定义域是▲.12.某飞机如果在1200米的上空测得地面控制点的俯角为30,那么此时飞机离控制点之间的距离是▲米.13.一个口袋中装有3个完全相同的小球,它们分别标有数字0,1,3,从口袋中随机摸出一个小球记下数字后不放回,摇匀后再随机摸出一个小球,那么两次摸出小球的数字的和为l3l2l1FEDCBA图1—2—素数的概率是▲.14.如图2,在四边形ABCD中,点M、N、P分别是AD、BC、BD的中点,如果aBA,bDC,那么MN▲.(用a和b表示)15.如果某市6月份日平均气温统计如图3所示,那么在日平均气温这组数据中,中位数是▲C.16.已知点),(11yxA和点),(22yxB在反比例函数xky的图像上,如果当210xx,可得21yy,那么k▲0.(填“”、“=”、“”)17.如图4,点E、F分别在正方形ABCD的边AB、BC上,EF与对角线BD交于点G,如果5BE,3BF,那么:FGEF的比值是▲.18.如图5①,在矩形ABCD中,将矩形折叠,使点B落在边AD上,这时折痕与边AD和边BC分别交于点E、点F.然后再展开铺平,以B、E、F为顶点的△BEF称为矩形ABCD的“折痕三角形”.如图5②,在矩形ABCD中,2AB,4BC.当“折痕△BEF”面积最大时,点E的坐标为▲.三、解答题:(本大题共7题,满分78分)19.(本题满分10分)计算:22123323tan601.20.(本题满分10分)解方程组:22225,320.xyxxyy图2NPMDCBA图5①FEDCBA图5②xyDC(B)AO图3图4GFEDCBA—3—21.(本题满分10分)已知:如图6,在△ABC中,13ACAB,24BC,点P、D分别在边BC、AC上,ABADAP2,求APD的正弦值.22.(本题满分10分)自2004年5月1日起施行的《中华人民共和国道路交通安全法实施条例》中规定:超速行驶属违法行为.为确保行车安全,某一段全程为200千米的高速公路限速120千米/时(即任意一时刻的车速都不能超过120千米/时).以下是王师傅和李师傅全程行驶完这段高速公路时的对话片断.王:“你的车速太快了,平均每小时比我快20千米,比我少用30分钟就行驶完了全程.”李:“虽然我的车速快,但是最快速度比我的平均速度只快15%,并没有超速违法啊.”李师傅超速违法吗?为什么?23.(本题满分12分)如图7,已知在四边形ABCD中,AD∥BC,对角线AC、BD相交于点O,BD平分ABC,过点D作DF∥AB分别交AC、BC于点E、F.(1)求证:四边形ABFD是菱形;(2)设ACAB,求证:ACOEABEF.图6PDCBA图6OFEDCBA图7—4—24.(本题满分12分)如图8,在平面直角坐标系xOy中,二次函数213yxbxc的图像与y轴交于点A,与双曲线8yx有一个公共点B,它的横坐标为4.过点B作直线l∥x轴,与该二次函数图像交于另一点C,直线AC的截距是6.(1)求二次函数的解析式;(2)求直线AC的表达式;(3)平面内是否存在点D,使A、B、C、D为顶点的四边形是等腰梯形,如果存在,求出点D的坐标,如果不存在,说明理由.25.(本题满分14分)如图9,在Rt△ABC中,90C,14AC,3tan4A,点D是边AC上的一点,8AD.点E是边AB上一点,以点E为圆心,EA为半径作圆,经过点D.点F是边AC上一动点(点F不与A、C重合),作FGEF,交射线BC于点G.(1)用直尺圆规作出圆心E,并求圆E的半径长(保留作图痕迹);(2)当点G在边BC上时,设AFx,CGy,求y关于x的函数解析式,并写出它的定义域;(3)联结EG,当△EFG与△FCG相似时,推理判断以点G为圆心、CG为半径的圆G与圆E可能产生的各种位置关系.图8y11OxDCBA图9DCBA图9备用图—5—普陀区2015学年度第二学期九年级数学期终考试试卷参考答案及评分说明一、选择题:(本大题共6题,每题4分,满分24分)1.(B);2.(C);3.(A);4.(D);5.(B);6.(C).二、填空题:(本大题共12题,每题4分,满分48分)7.babam;8.x=2;9.21x;10.2;11.0x;12.2400;13.31;14.ab2121;15.22;16.;17.38;18.(23,2).三、解答题(本大题共7题,其中第19---22题每题10分,第23、24题每题12分,第25题14分,满分78分)19.解:原式=9+23931··························································(8分)=123.···········································································(2分)20.解:方程②可变形为20xyxy.·················································(2分)得:0yx或02yx,························································(2分)原方程组可化为2250xyxy,;22520xyxy,.·········································(2分)解得:1111021102xy,;2211021102xy,;3321xy,;4421xy,.····························(4分)∴原方程组的解是1111021102xy,;2211021102xy,;3321xy,;4421xy,.21、解:过点A作BCAE,垂足为点E.················································(1分)∵ABADAP2,ACAB,∴ACADAP2.····································································(1分)∴ACAPAPAD.CAPPAD,···································································(1分)∴△APD∽△ACP.································································(1分)得CAPD.······································································(1分)∵ACAB,BCAE,∴1221BCCE.····························(2分)∵BCAE,13AC,∴由勾股定理得5AE.······················(1分)∴135sinACAEC.·································································(1分)—6—即135sinAPD.···································································(1分)22.解:设李师傅的平均速度为x千米/时,王师傅的平均速度为(20)x千米/时.(1分)根据题意,可列方程2002001202xx.···············································(3分)整理得22080000xx.解得1100x,280x.·······························································(2分)经检验,1100x,280x都是原方程的解.因为速度不能负数,所以取100x.(1分)李师傅的最快速度是:100115%115千米/时,小于120千米/时.·(2分)答:李师傅没有超速.··································································(1分)23.证明:(1)∵AD∥BC,DF∥AB,∴四边形ABFD是平行四边形.··········································(1分)∵AD∥BC,∴ADBDBC.····································(1分)∵BD平分ABC,∴ABDDBC.····························(1分)∴ABDADB.·························································(1分)∴ADAB.··································································(1分)∴四边形ABFD是菱形.····················································(1分
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