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2019中考数学一轮复习第一部分教材同步复习第一章数与式第5讲分式权威预测.doc

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1第一部分 第一章 第 5 讲1化简： .m 15m2 9 23 m解：原式 m 15 m 3 m 3 2m 3 m 15 m 3 m 3 2 m 3 m 3 m 33 m 3 m 3 m 3 .3m 32先化简，再求值： ( 1)，其中 x .x2 1x 2 1x 2 13解：原式 x2 1x 2 1 x 2x 2 x 1 x 1x 2 x 2 x 1( x1)1 x.当 x 时，原式1 .13 13 23

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