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计算：x^2+y^2/x-y-2xy/x-y计算：x^2+y^2/x-y-2xy/x-yx^2+y^2/x-y-2xy/x-y(x^2+y^2-2xy)/(
计算：x^2+y^2/x-y-2xy/x-y
计算：x^2+y^2/x-y-2xy/x-y
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