河南省2019年中考数学总复习第一章数与式第三节分式好题随堂演练.doc

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1分式好题随堂演练1(2017贺州)下列式子中是分式的是( )A. B. C. D.1 x3 1x 1 252(2018江西)计算(a) 2 的结果为( )ba2Ab Bb Cab D.ba3(2018台州)计算 ,结果正确的是( )x 1x 1xA1 Bx C. D. 1x x 2x4(2018金华)若分式 的值为 0,则 x 的值为( )x 3x 3A3 B3 C3 或3 D05(2018盐城)要使分式 有意义,则 x 的取值范围是_.1x 26(2018湖州)当 x1 时,分式 的值是_.xx 27(2018衡阳) _.x2x 1 1x 18(2017吉林 )某学生化简分式 出现了错误,解答过程如下:原式 1x 1 2x2 1 1( x 1) ( x 1)(第一步)2( x 1) ( x 1) (第二步)1 2( x 1) ( x 1) .(第三步)3x2 1(1)该学生解答过程是从第_步开始出错的,其错误原因是_;(2)请写出此题正确的解答过程.参考答案1C 2.A 3.A 4.A 5.x2 6. 7.x1138解:(1)一、分式的基本性质用错;2(2)原式 x 1( x 1) ( x 1) 2( x 1) ( x 1)x 1( x 1) ( x 1) .1x 1

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