(xy-x^2)÷x^2-2xy+y^2/xy*x-y/y^2*yx^-2(xy-x^2)÷{x^2-2xy+y^2/xy}*{x-y/y^2}*{yx^-2}

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**(xy-x^2)÷x^2-2xy+y^2/xyx-y/y^2yx^-2(xy-x^2)÷{x^2-2xy+y^2/xy}{x-y/y^2}{yx^-2}**

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题目内容：

(xy-x^2)÷x^2-2xy+y^2/xyx-y/y^2yx^-2
(xy-x^2)÷{x^2-2xy+y^2/xy}{x-y/y^2}{yx^-2}

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