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
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