(x-y)的立方+(y-x)
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(x-y)的立方+(y-x)(x-y)的立方+(y-x)(x-y)的立方+(y-x)原式=(x-y)³-(x-y)=(x-y)[(x-y)²-1]=(x-y)(x-y+1)(x-y
(x-y)的立方+(y-x)
(x-y)的立方+(y-x)
(x-y)的立方+(y-x)
原式=(x-y)³-(x-y)
=(x-y)[(x-y)²-1]
=(x-y)(x-y+1)(x-y-1)
(x-y)的立方+(y-x)
=(x-y)³-(x-y)
=(x-y)[(x-y)²-1]
=(x-y)(x-y+1)(x-y-1)
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