计算 :2(x-y)^2-(y-x)^2-(x+y)(y-x)

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计算:2(x-y)^2-(y-x)^2-(x+y)(y-x)计算:2(x-y)^2-(y-x)^2-(x+y)(y-x)计算:2(x-y)^2-(y-x)^2-(x+y)(y-x) 

计算 :2(x-y)^2-(y-x)^2-(x+y)(y-x)
计算 :2(x-y)^2-(y-x)^2-(x+y)(y-x)

计算 :2(x-y)^2-(y-x)^2-(x+y)(y-x)