2010年达州市高级中学期中考试八年级数学试题

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本资料来自于资源最齐全的21世纪教育网世纪教育网--中国最大型、最专业的中小学教育资源门户网站。版权所有@21世纪教育网达州市高级中学2010年秋季期中考试八年级数学试题本试卷分为第Ⅰ卷(选择题)和第Ⅱ卷(非选择题)两部分.第Ⅰ卷1页,第Ⅱ卷2至5页.考试时间100分钟,满分100分.第Ⅰ卷填在答题卡内.第Ⅰ卷(选择题共24分)一、精心选一选(每小题3分,共24分,在每小题只有一项是符合题目要求的)1、4的算术平方根是A、16B、2C、2D、22、估算171的值在A、2和3之间B、3和4之间C、4和5之间D、5和6之间3、下面计算正确的是A、3333B、3327C、532D、244、已知Rt△ABC中,∠C=90°,若a+b=14cm,c=10cm,则Rt△ABC的面积是()A、24cm2B、36cm2C、48cm2D、60cm25、在下列长度的各组线段中,能组成直角三角形的是A、5,6,7B、5,12,13C、1,4,9D、5,11,126、菱形的两条对角线长分别是6cm和8cm,则它的面积是A、26cmB、212cmC、224cmD、248cm7、在下列各数中,227,2,53,212,0,3127,127,0.4545545554……(相邻两个4之间5的个数逐次加1)中,无理数的个数有A、1个B、2个C、3个D、4个8、下列图形中,由原图平移得到的图形是本资料来自于资源最齐全的21世纪教育网世纪教育网--中国最大型、最专业的中小学教育资源门户网站。版权所有@21世纪教育网达州市高级中学2010年秋季期中考试八年级数学试题一、精心选一选(每小题3分,共24分)八年级姓名考号密封线内不得答题本资料来自于资源最齐全的21世纪教育网世纪教育网--中国最大型、最专业的中小学教育资源门户网站。版权所有@21世纪教育网题号12345678答案第Ⅱ卷(非选择题共76分)二、耐心填一填(每题3分,共21分)9、算术平方根和立方根都等于本身的数是;10、364的算术平方根是;11、观察=9=4+5,则有;=25=12+13,则有;=49=24+25,则有.按此规律接续写出一个式子.12、ABCD中,若AB=3cm,AD=5cm,则ABCD的周长为;13、20102009)32()32(=___________;14、若a、b、c是△ABC的三边的长,且满足010)8(62cba,则S△ABC=______;15、观察下列图形:它们是按一定规律排列的,依照此规律,第2010个图形中共有个★.三、解答题(共55分)(请写出必要的解答过程)16(8分)仔细算一算(1)014.3263(2))25)(25(8327217、(6分)已知,如图,在ABCD中,∠A=135°,AB=5cm,BC=9cm,求∠B,∠C的大小及AD,CD的长.本资料来自于资源最齐全的21世纪教育网世纪教育网--中国最大型、最专业的中小学教育资源门户网站。版权所有@21世纪教育网18、(6分)将下图的△ABC向上平移5个格,得到△A1B1C1,再将△A1B1C1绕顶点A1按逆时针的方向旋转90º,画出平移、旋转后的图案.19、(6分)如图,居民楼与马路是平行的,相距9m,在距离载重汽车41m处就可受到噪声影响,试求在马路上以4m/s速度行驶的载重汽车,给一楼的居民带来多长时间的噪音影响?若时间超过25秒,则此路禁止该车通行,你认为载重汽车可以在这条路上通行吗?20、(6分)已知:如图,等边三角形ABC中,D、E分别是BC、AC上的点,且AE=CD,(1)求证:AD=BE本资料来自于资源最齐全的21世纪教育网世纪教育网--中国最大型、最专业的中小学教育资源门户网站。版权所有@21世纪教育网(2)求:∠BFD的度数.21、(7分)类比学习:一动点沿着数轴向右平移3个单位,再向左平移2个单位,相当于向右平移1个单位.用实数加法表示为1)2(3.若坐标平面上的点作如下平移:沿x轴方向平移的数量为a(向右为正,向左为负,平移a个单位),沿y轴方向平移的数量为b(向上为正,向下为负,平移b个单位),则把有序数对{a,b}叫做这一平移的“平移量”;“平移量”{a,b}与“平移量”{c,d}的加法运算法则为}{}{}{dbcadcba,,,.解决问题:(1)计算:{3,1}+{1,2};{1,2}+{3,1}.(2)①动点P从坐标原点O出发,先按照“平移量”{3,1}平移到A,再按照“平移量”{1,2}平移到B;若先把动点P按照“平移量”{1,2}平移到C,再按照“平移量”{3,1}平移,最后的位置还是点B吗?在图中画出四边形OABC.②证明四边形OABC是平行四边形.22、(7分)如图:四边形ABCD中,AB=CB=2,CD=5,DA=1,且AB⊥本资料来自于资源最齐全的21世纪教育网世纪教育网--中国最大型、最专业的中小学教育资源门户网站。版权所有@21世纪教育网CB于B.试求:(1)∠BAD的度数;(2)四边形ABCD的面积.23、(9分)已知,如图,ABCD中,AB⊥AC,AB=1,BC=5,对角线AC、BD交于O点,将直线AC绕点O顺时针旋转,分别交BC、AD于点E、F.(1)试说明:当旋转角为90°时,四边形ABEF是平行四边形;(2)试说明在旋转过程中,线段AF与EC总保持相等;(3)在旋转过程中,四边形BEDF可能是菱形吗?如果不能,请说明理由;如果能,说明理由并求出此时AC绕O顺时针旋转的度数.达州市高级中学2010年秋季期中考试本资料来自于资源最齐全的21世纪教育网世纪教育网--中国最大型、最专业的中小学教育资源门户网站。版权所有@21世纪教育网八年级数学试题参考答案题号12345678答案BDBABCCD9、1或0;10、2;11、41408192,则22241409;12、16㎝;13、23;14、24;15、)13(n16、⑴014.3263=1263··································································································1分=1218=19·······································································································2分=13=2··············································································································4分⑵)25)(25(83272=])2()5[(22242622·······································································1分=)25(2222·····························································································2分=31··········································································································3分=2············································································································4分17、∵四边形ABCD是平行四边形,∴AD∥BC,AD=BC=9㎝,CD=AB=5㎝,∠C=∠A=135°,···················································································································4分∴∠A+∠B=180°,本资料来自于资源最齐全的21世纪教育网世纪教育网--中国最大型、最专业的中小学教育资源门户网站。版权所有@21世纪教育网∴∠B=45°.··································································································6分18、解:如图··························································6分19、由题意可得AC=9m,AB=41m.在Rt△ABC中,222241940BCABAC······································2分∴时间240204t(秒)·············································································4分∵20<25,∴汽车可以通行.···········································································5分答:载重汽车可以在这条路上通行·····································································6分20、(1)证明:∵△ABC是等边三角形∴∠BAC=∠C=60°,AB=CA在△ABE和△CAD中∴△ABE≌△CAD(SAS)···············································································3分∴AD=BE(全等三角形对应边相等)(2)解:∵△ABE≌△CAD(已证)∴∠ABE=∠CAD(全等三角形对应角相等)又∵∠BFD=∠BAD+∠ABE∴∠BFD=∠BAD+∠CAD=∠BAC又∠BAC=60°∴∠BFD=60°·······························································································6分21、解:(1){3,1}+{1,2}={4,3};{1,2}+{3,1}={4,3}··································2分)()()(已知已证已证CDAECBACCAAB本资料来自于资源最齐全的21世纪教育网世纪教育网--中国最大型、最专业的中小学教育资源门户网站。版权所有@21世纪教育网(2)①画图最后的位置仍是B.······················································································4分②证明:由①知,A(3,1),B(4,3),C(1,2)∴OC=AB=2221=5,OA=BC=2213=10,∴四边形OABC是平行四边形.···························································································

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