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a3+a2-a-1怎么算
人气:275 ℃ 时间:2020-06-21 01:11:10
解答
a³+a²-a-1
=a²(a+1)-(a+1)
=(a+1)(a²-1)
=(a+1)(a+1)(a-1)
=(a+1)²(a-1)
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