(a+b)(a²-ab+b²)-(a+b)³
人气:383 ℃ 时间:2020-05-11 00:46:19
解答
(a+b)(a²-ab+b²)-(a+b)³
=(a+b)(a²-ab+b²-a²-2ab-b²)
=(a+b)(-3ab)
=-3a²b-3ab²
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