计算﹙xy-x²﹚÷[﹙x-y﹚/xy]

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计算﹙xy-x²﹚÷[﹙x-y﹚/xy]
计算﹙xy-x²﹚÷[﹙x-y﹚/xy]

计算﹙xy-x²﹚÷[﹙x-y﹚/xy]
(xy-x²)÷[(x-y)/xy]
=x(y-x)×(xy)÷(x-y)
= -x²y(x-y)÷(x-y)
=-x²y

﹙xy-x²﹚÷[﹙x-y﹚/xy]
=-x(x-y)xy/(x-y)
=-x²y