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