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数学
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先化简后求值(xy-x^2)÷(x^2-2xy+y^2)/(xy)*(x-y)/(x^2) x=-2005 y=-2
人气：370 ℃ 时间：2020-06-17 06:11:51
解答
原式=-x(x-y)*xy/(x-y)²*(x-y)/x²
=-x²y/(x-y)*(x-y)/x²
=-y
=-(-2)
=2怎么得的-y？约分采纳吧
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