初中分式计算：（xy-x²）·xy/x-y

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初中分式计算：（xy-x²）·xy/x-y初中分式计算：（xy-x²）·xy/x-y初中分式计算：（xy-x²）·xy/x-y（xy-x²）·xy/x-y=x（

初中分式计算：（xy-x²）·xy/x-y
初中分式计算：（xy-x²）·xy/x-y

初中分式计算：（xy-x²）·xy/x-y
（xy-x²）·xy/x-y
=x（y-x）·xy/x-y
=-x²y

解
(xy-x²)×(xy)/(x-y)
=x(y-x)×(xy)/(x-y)
=-x(x-y)×(xy)/(x-y)
=-x²y

x(y-x)*xy/(x-y)=-x(x-y)*xy/(x-y)=-x*xy=-x2y