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计算﹙xy-x²﹚÷[﹙x-y﹚/xy]
人气:326 ℃ 时间:2020-04-01 01:00:33
解答
(xy-x²)÷[(x-y)/xy]
=x(y-x)×(xy)÷(x-y)
= -x²y(x-y)÷(x-y)
=-x²y
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