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)
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