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(a-b)[(a+b)3-2ab(a2-b2)]
人气:439 ℃ 时间:2020-02-05 16:40:16
解答
(a-b)[(a+b)3-2ab(a2-b2)]
=(a²-b²)[(a+b)²-2ab]
=(a²-b²)(a²+b²)
=a^4-b^4不是有个中括号吗?
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