云南省2018年中考数学总复习第一章数与式第四节分式好题随堂演练.doc

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1第一章 数与式好题随堂演练1计算 的结果是_1 4a22a 12(2018衡阳)计算: _x2x 1 1x 13(2018滨州)若分式 的值为 0,则 x 的值为_ x2 9x 34(2018武汉)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 Dx25(2018江西)计算(a) 2 的结果为( )ba2Ab BbCab D.ba6(2018福建 A 卷)先化简,再求值:( 1) ,其中 m 1.2m 1m m2 1m 3参考答案112a 2.x1 3.34D 5.A6解:原式 2m 1 mm mm2 1 m 1m m( m 1) ( m 1)2 .1m 1当 m 1 时,原式 .313 1 1 33

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