计算:x^2+y^2/x-y-2xy/x-y

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计算:x^2+y^2/x-y-2xy/x-y

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