初二分式计算,为啥我算不出来

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初二分式计算,为啥我算不出来初二分式计算,为啥我算不出来 初二分式计算,为啥我算不出来1-x/x全部展开收起4除x+1[(x+1)(x-1)/(x-1)/(x-1)-(x-1)/(x+1)]

初二分式计算,为啥我算不出来
初二分式计算,为啥我算不出来
 

初二分式计算,为啥我算不出来

1-x/x

收起

4除x+1

[(x+1)(x-1)/(x-1)/(x-1)-(x-1)/(x+1)]÷x/(x-1)
=[(x+1)/(x-1)-(x-1)/(x+1)]×(x-1)/x
=[(x+1)²-(x-1)²]/(x+1)(x-1) ×(x-1)/x
=4x/(x+1)(x-1) ×(x-1)/x
=4/(x+1)