计算(x-y)(y^2-x^2)(-x-y)
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计算(x-y)(y^2-x^2)(-x-y)计算(x-y)(y^2-x^2)(-x-y)计算(x-y)(y^2-x^2)(-x-y)(x-y)(y^2-x^2)(-x-y)=(x-y)(x-y)(x+
计算(x-y)(y^2-x^2)(-x-y)
计算(x-y)(y^2-x^2)(-x-y)
计算(x-y)(y^2-x^2)(-x-y)
(x-y)(y^2-x^2)(-x-y)
=(x-y)(x-y)(x+y)(x+y)
=（(x-y)(x+y)）^2
=（x^2-y^2）^2
原式=(x-y)(x^2-y^2)(x+y)=(x-y)^2(x+y)^2
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