（xy-x^2)乘以(xy)/(x-y)= x(y-x)乘以（xy）/(x-y)= -x(x-y)乘以（xy）/(x-y)= -x^2y这样做对吗?
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（xy-x^2)乘以(xy)/(x-y)=x(y-x)乘以（xy）/(x-y)=-x(x-y)乘以（xy）/(x-y)=-x^2y这样做对吗?（xy-x^2)乘以(xy)/(x-y)=x(y-x)乘以
（xy-x^2)乘以(xy)/(x-y)= x(y-x)乘以（xy）/(x-y)= -x(x-y)乘以（xy）/(x-y)= -x^2y这样做对吗?
（xy-x^2)乘以(xy)/(x-y)
= x(y-x)乘以（xy）/(x-y)
= -x(x-y)乘以（xy）/(x-y)
= -x^2y
这样做对吗?
（xy-x^2)乘以(xy)/(x-y)= x(y-x)乘以（xy）/(x-y)= -x(x-y)乘以（xy）/(x-y)= -x^2y这样做对吗?
对 .
前提是x不等于y
对