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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?

题目详情
(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?
▼优质解答
答案和解析
对 .
前提是x不等于y