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南通七年级数学上学期期末调研测试卷及答案

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南通地区2010——2011学年度(上)期末调研测试卷七年级数学(满分100分,答卷时间120分钟)题号一二三总分结分人19~2021~2223~2425~262728得分一、选择题(本题共8小题;每小题2分,共16分)下列各题都有代号为A、B、C、D的四个结论供选择,其中只有一个结论是正确的,请把正确结论的代号填入题号前的括号内.【】1.如图,是某种几何体表面展开图的图形.这个几何体是A.圆锥B.球C.圆柱D.棱柱【】2.下列近似数精确到0.001且有三个有效数字的是A.0.00504B.0.504C.5.040D.50.400【】3.下列各数中是负数的是A.-(-12)B.-│-12│B.(-12)2D.-(-12)3【】4.一种面粉的质量标识为“25±0.25千克”,则下列面粉中合格的是A.25.30千克B.24.70千克C.25.51千克D.24.80千克【】5.下列四个图形中,能用∠1、∠AOB、∠O三种方法表示同一个角的图形是A.B.C.D.【】6.若点A在数轴上表示的数a满足a=-a,则点A在数轴上的位置是A.原点及原点右边B.原点C.原点及原点左边D.数轴上任意一点【】7.在-0.1428中用数字3替换其中的一个非0数字后,使所得的数最大,则被得分评卷人AOB1AOB1CAOB1CAOB1²第1题第13题替换的数字是A.1B.2C.4D.8【】8.某公园将一长方形草地改造,长增加20%,宽减少20%,则这块长方形草地的面积A.减少4%B.不改变C.增大4%D.增大10%二、填空题(本题共10小题;每小题2分,共20分)把最后结果填在题中横线上.9.在树上有一只蜗牛,白天向上挪动5cm,记为+5cm,晚间向下掉了2cm,可记作cm.10.数轴上的A点表示的数是-3,数轴上另一点B到A点的距离是2,则B点所表示的数是____________.11.我国是一个严重缺水的国家,大家应倍加珍惜水资源,节约用水。据测试,拧不紧的水龙头每秒钟会滴下2滴水,每滴水约05.0毫升。小明同学在洗手后,没有把水龙头拧紧,当小明离开4小时后水龙头滴了毫升水.(用科学记数法表示)12.一个几何体从正面、左面、上面看都是同样大小的圆,这个几何体是.13.如图,钟表8时30分时,时针与分针所成的锐角的度数为.14.如图,把弯曲的河道改直,能够缩短航程,这样做根据的道理是.15.若0nm,则nmnm0.(填“<”、“>”或“=”)16.已知整式622xx的值为9,则6422xx的值为.得分评卷人第14题17.如图,将三个同样的正方形的一个顶点重合放置,那么1的度数为.18.如图,对于大于或等于2的自然数n的平方进行如下“分裂”,分裂成n个连续奇数的和,则自然数92的分裂数中最大的数是.第17题图第18题图三、解答题(本题共10小题,共64分)(第19题8分,第20题8分,共16分)19.简便计算:(1)1717169(2)51141525.051120.解方程(1)435.0102xx(2)23311xx得分评卷人221332153742153„„(第21题4分,第22题6分,共10分)21.如图,A、B两地均为海上观测站,从A地发现它的西南方向上有一艘船,同时,从B地发现它在南偏东30°方向上,试在图中确定这艘船(用点M表示)的位置.22.已知:02232yx,化简)3123()3141(222yxyxx再求值.得分评卷人AB北(第23题4分,第24题6分,共10分)23.小强用5个大小一样的正方形制成如图所示的拼接图形(阴影部分),请你在图中的拼接图形上再接一个正方形,使新拼接成的图形经过折叠后能成为一个封闭的正方体盒子.注意:只需添加一.个.符合要求的正方形,并用阴影..表示.24.如图,已知,∠AOE=∠COD,且射线OC平分∠AOE的补角∠EOB.∠EOD=30°,求∠AOD的度数.得分评卷人得分评卷人BACODEA(第25题6分,第26题6分,共12分)25.已知某铁路桥长500m,现在一列火车匀速通过该桥,火车从开始上桥到过完桥共用了30s,整列火车完全在桥上的时间为20s,则火车的长度为多少m?26.如图,在长方形中挖去两个三角形.(1)用含a、b的式子表示图中阴影部分的面积;(2)当10a,8b时求图中阴影部分的面积.a2aab(第27题8分)27.有3个有理数x、y、z若n211x且x与y互为相反数,y与z为倒数.(1)当n为奇数时,你能求出x、y、z这三个数吗?当n为偶数时,你能求出x、y、z这三个数吗?能,请计算并写出结果;不能,请说明理由(2)根据(1)的结果计算:xy-yn-(y-z)2011的值.得分评卷人(第28题8分)28.已知:如图1,M是定长线段AB上一定点,C、D两点分别从M、B出发以1cm/s、3cm/s的速度沿直线BA向左运动,运动方向如箭头所示(C在线段AM上,D在线段BM上)(1)若AB=10cm,当点C、D运动了2s,求AC+MD的值.(2)若点C、D运动时,总有MD=3AC,直接填空:AM=AB.(3)在(2)的条件下,N是直线AB上一点,且AN-BN=MN,求ABMN的值.图1图2得分评卷人ABMCDABM2010——2011学年度(上)期末调研测试卷七年级数学参考答案一、选择题(本题共8小题,每小题2分,共16分)1.A2.B3.B4.D5.B6.B7.C8.A二、填空题(本题共10小题;每小题2分,共20分)9.-210.-5或-111.31044.112.球13.75°14.两点之间线段最短15.>16.1217.20°18.17三、解答题(本题共10小题;共64分)19.(1)解:原式=1717110„„„„„„„„„„„„„„„„„„„2分=171711710=169„„„„„„„„„„„„„„„„„„„„„„„„„4分(2)解:原式=42151141511„„„„„„„„„„„„„„„„„„„2分=42141511=11„„„„„„„„„„„„„„„„„„„„„„„„„„„„4分20.解:(1)435.0102xx4320xx„„„„„„„„„„„„„„„„„„2分12x„„„„„„„„„„„„„„„„„„„„„4分(2)6-2(x-1)=3(x+3)„„„„„„„„„„„„„„„„„„„„„2分6-2x+2=3x+9-5x=151x„„„„„„„„„„„„„„„„„„„„„„„„4分21.图略„„„„„„„„„„„„„„„„„„„„„„„„„„„„„„„4分22.解:∵023x,022y∴02,023yx∴2,23yx„„„„„„„„„„„„„„„„„„„„„„„„„2分原式=2231233221yxyxx=2yx„„„„„„„„„„„„„„„„„„„„„„„„„„4分=252232„„„„„„„„„„„„„„„„„„„„„„„6分23.解:答案不惟一,如图等.„„„„„„„„„„„„„„„„„„„„„„„4分24.解:∵∠AOB=180°∠EOD=30°∴∠AOD+∠EOC+∠COB=150°„„„„„„2分∵∠AOE=∠COD∴∠AOD=∠EOC„„„„„„„„„„„„„„„„4分∵OC平分∠EOB∴∠EOC=∠COB∴∠EOC=∠COB=∠AOD=50°„„„6分25.解:设火车的长度为xm,根据火车的速度不变可得方程:2050030500xx„„„„„„„„„„„„„„„„„„„„„3分xx50035002100x∴火车的长度为100m.„„„„„„„„„„„„„„„6分26.解:图中阴影部分的面积为ababab2212„„„„„„„„„„„„„3分当10a,8b时,图中阴影部分的面积为80810„„„„„„„6分27.解:(1)当n为奇数时n211x=2-1-1=-1∵x与y互为相反数∴y=-x=1∵y与z为倒数∴11zy∴x=-1y=1z=1„„„„„„„„„„„„„„„„„„4分当n为偶数时(1)1n=11=0∵分母不能为零∴不能求出x、y、z这三个数„„„„„„„„6分(2)当x=-1y=1z=1时2011nzyyxy=2011(1)11(11)n=2„„„„„„„„„„„„„„„„„„„„„8分28.解:(1)当点C、D运动了2s时,CM=2cm,BD=6cm∵AB=10cm,CM=2cm,BD=6cm∴AC+MD=AB-CM-BD=10―2―6=2cm„„„„„„„„„„2分(2)14„„„„„„„„„„„„„„„„„„„„„„„„„„„„„„4分(3)当点N在线段AB上时,如下图∵AN-BN=MN,又∵AN-AM=MN∴BN=AM=14AB,∴MN=12AB,即12MNAB.当点N在线段AB的延长线上时,如下图∵AN-BN=MN,又∵AN-BN=AB∴MN=AB,即1MNAB.综上所述ABMN=121或.„„„„„„„„„„„„„„„„„„„„„8分ABMNABMN南通七年级数学上学期期末调研测试卷及答案

西红柿

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