福建省2019年中考数学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第四节 分式好题随堂演练1(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 Bx2 Cx2 Dx22(2018江西)计算(a) 2 的结果为( )ba2Ab Bb Cab D.ba3计算 的结果是 1 4a22a 14(2018衡阳)计算: x2x 1 1x 15(2018滨州)若分式 的值为 0,则 x 的值为 x2 9x 36(2018泰州)化简: .(2x 1x 1) x2 6x 9x2 17(2018重庆 B 卷改编)先化简,再求值:(a1 ) ,其中 a2.4a 1a 1 a2 8a 16a 128先化简,再求值: 1,在 0,1,2 三个数中选一个合适的代入求值x2 4x 42x x2 2xx2参考答案1D 2.A 3.12a 4.x1 5.36原式 .x 1x 37原式 ,aa 4将 a2 代入得,原式1.8原式 ,当 x0 或 2 时,分式无意义,x2故 x 只能等于 1,原式 .12

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