中小学教育资源及组卷应用平台 北师大版八年级数学下册 期末达标测试卷 (时间:120分钟 满分:120分 ) 班级: 姓名: 得分: . 一、选择题(每题3分,共30分) 1.若分式的值为0,则x的值是( ) A.2或-2 B.2 C.-2 D.0 2.下列图形中,既是轴对称图形又是中心对称图形的是( ) INCLUDEPICTURE"9A35.tif" INCLUDEPICTURE "D:\\方正转Word\\8北师\\9A35.tif" \* MERGEFORMATINET INCLUDEPICTURE "E:\\22春\\8BS\\9A35.tif" \* MERGEFORMATINET INCLUDEPICTURE "E:\\22春\\8BS\\9A35.tif" \* MERGEFORMATINET 3.不等式组的解集在数轴上可表示为( ) INCLUDEPICTURE"XS9.tif" INCLUDEPICTURE "D:\\方正转Word\\8北师\\XS9.tif" \* MERGEFORMATINET INCLUDEPICTURE "E:\\22春\\8BS\\XS9.tif" \* MERGEFORMATINET INCLUDEPICTURE "E:\\22春\\8BS\\XS9.tif" \* MERGEFORMATINET 4.在 ABCD中,对角线AC,BD交于点O,下列结论错误的是( ) A.∠ABO=∠CDO B.∠BAD=∠BCD C.AB=CD D.AC⊥BD 5.下列式子从左到右的变形中,属于因式分解的是( ) A.(x+1)(x-1)=x2-1 B.x2-2x+1=x(x-2)+1 C.a2-b2=(a+b)(a-b) D.mx+my+nx+ny=m(x+y)+n(x+y) 6.某次知识竞赛共有20道题,每答对一道题得10分,答错或不答都扣5分.娜娜得分要超过90分,设她答对了x道题,则根据题意可列不等式为( ) A.10x-5(20-x)≥90 B.10x-5(20-x)>90 C.20×10-5x>90 D.20×10-5x≥90 7.如图,P(m,n)为△ABC内一点,△ABC经过平移得到△A′B′C′,平移后点P与其对应点P′关于x轴对称,若点B的坐标为(-2,1),则点B的对应点B′的坐标为( ) INCLUDEPICTURE"DE217.tif" INCLUDEPICTURE "D:\\方正转Word\\8北师\\DE217.tif" \* MERGEFORMATINET INCLUDEPICTURE "E:\\22春\\8BS\\DE217.tif" \* MERGEFORMATINET INCLUDEPICTURE "E:\\22春\\8BS\\DE217.tif" \* MERGEFORMATINET A.(-2,1-2n) B.(-2,1-n) C.(-2,-1) D.(m,-1) 8.某工厂新引进一批电子产品,甲工人比乙工人每小时多搬运30件电子产品,已知甲工人搬运300件电子产品所用的时间与乙工人搬运200件电子产品所用的时间相同.若设乙工人每小时搬运x件电子产品,则可列方程为( ) A.= B.= C.= D.= 9.已知x+y=4,x-y=,则式子的值是( ) A.48 B.2 C.16 D.12 10.如图,△ABC是等边三角形,P是∠ABC的平分线BD上一点,PE⊥AB于点E,线段BP的垂直平分线交BC于点F,垂足为点Q.若BF=2,则PE的长为( ) A.2 B.2 C. D.3 INCLUDEPICTURE"F110.tif" INCLUDEPICTURE "D:\\方正转Word\\8北师\\F110.tif" \* MERGEFORMATINET INCLUDEPICTURE "E:\\22春\\8BS\\F110.tif" \* MERGEFORMATINET INCLUDEPICTURE "E:\\22春\\8BS\\F110.tif" \* MERGEFORMATINET INCLUDEPICTURE"F112.tif" INCLUDEPICTURE "D:\\方正转Word\\8北师\\F112.tif" \* MERGEFORMATINET INCLUDEPICTURE "E:\\22春\\8BS\\F112.tif" \* MERGEFORMATINET INCLUDEPICTURE "E:\\22春\\8BS\\F112.tif" \* MERGEFORMATINET INCLUDEPICTURE"QB23.tif" INCLUDEPICTURE "D:\\方正转Word\\8北师\\QB23.tif" \* MERGEFORMATINET INCLUDEPICTURE "E:\\22春\\8BS\\QB23.tif" \* MERGEFORMATINET INCLUDEPICTURE "E:\\22春\\8BS\\QB23.tif" \* MERGEFORMATINET INCLUDEPICTURE"XS12.tif" INCLUDEPICTURE "D:\\方正转Word\\8北师\\XS12.tif" \* MERGEFORMATINET INCLUDEPICTURE "E:\\22春\\8BS\\XS12.tif" \* MERGEFORMATINET INCLUDEPICTURE "E:\\22春\\8BS\\XS12.tif" \* MERGEFORMATINET (第10题) (第14题) (第15题) (第16题) 二、填空题(每题3分, ... ...
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