(xy-x²）²÷（x-y)²/xy·x-y/x² 计算

(xy-x²）²÷（x-y)²/xy·x-y/x² 计算
(xy-x²）²÷（x-y)²/xy·x-y/x² 计算

(xy-x²）²÷（x-y)²/xy·x-y/x² 计算
(xy-x²）²÷（x-y)²/xy·x-y/x²
=x²(y-x)²÷（x-y)²/xy·x-y/x²
=x³y·x-y/x²
=xy(x-y)
=x²y-xy²
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