2a²(a+b)²-3(a+b)的三次方=?
人气:265 ℃ 时间:2019-10-19 12:22:16
解答
2a²(a+b)²-3(a+b)³
=(a+b)²[2a²-3(a+b)]
=(a+b)²(2a²-3a-3b)
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