(xy-x^2)÷(x^2-2xy+y^2)/xy*(x-y)/x^2

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答案和解析

(xy-x^2)÷(x^2-2xy+y^2)/xy*(x-y)/x^2
=(xy-x^2)*xy/(x^2-2xy+y^2)*(x-y)/x^2
=x(y-x)*xy/(x-y)^2*(x-y)/x^2
=-x*xy/x^2
=-y

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