山东省德州市2019中考数学复习第一章数与式第三节分式要题随堂演练2019011725.doc

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1、1第三节 分式要题随堂演练1(2018武汉中考)若分式 在实数范 围内有意义,则实数 x 的取值范围是( )1x 2Ax2 Bx2Cx2 Dx22(2018内江中考)已知: ,则 的 值是( )1a 1b 13 abb aA. B 13 13C3 D33(2017泰安中考)化简(1 )(1 )的结果为( )2x 1x2 1x2A. B.x 1x 1 x 1x 1C. D.x 1x x 1x4(2018滨州 中考)若分式 的值为 0,则 x 的值为 .x2 9x 35(2018衡阳中考)计算: x2x 1 1x 16(2018青岛中考)化简:( 2) .x2 1x xx2 17(2018临沂中考

2、)计算:( ) .x 2x2 2x x 1x2 4x 4 x 4x28(2018烟台中考)先化简, 再求值:(1 ) .其中 x 满足 x22x50.x2 2x 2 x 1x2 4x 43参考答案1D 2.C 3.A 4.3 5.x 1 6解:原式( )x2 1x 2xx x( x 1) ( x 1) .( x 1) 2x x( x 1) ( x 1) x 1x 17解:原式 x 2x( x 2) x 1( x 2) 2 xx 4 ( x 2) ( x 2)x( x 2) 2 x( x 1)x( x 2) 2 xx 4 x2 4 x2 xx( x 2) 2 xx 4 x 4x( x 2) 2 xx 4 .1( x 2) 28解:原式 x2 xx 2 ( x 2) 2x 1 x( x 1)x 2 ( x 2) 2x 1x 22x.x 22x50,x 22x5,原式5.

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