(a-b)的三次方-(a-b)

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(a-b)的三次方-(a-b)
(a-b)的三次方-(a-b)

(a-b)的三次方-(a-b)
(a-b)的三次方-(a-b)
=(a-b)[(a-b)²-1]
=(a-b)(a-b+1)(a-b-1)

(a-b)³-(a-b)=(a-b)(a²-2ab+b²-1)

(a-b)³-(a-b)
=(a-b)[(a-b)²-1]
=(a-b)(a-b+1)(a-b-1)