先化简后求值(xy-x^2)÷(x^2-2xy+y^2)/(xy)*(x-y)/(x^2) x=-2005 y=-2
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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
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