计算(xy-x²) 乘以 xy/x-y
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计算(xy-x²)乘以xy/x-y计算(xy-x²)乘以xy/x-y计算(xy-x²)乘以xy/x-y(xy-x²)乘以xy/x-y=x^2*y(y-x)/(x
计算(xy-x²) 乘以 xy/x-y
计算(xy-x²) 乘以 xy/x-y
计算(xy-x²) 乘以 xy/x-y
(xy-x²) 乘以 xy/x-y
=x^2*y(y-x)/(x-y)
=-x^2*y