(a-1)(a²+a+1)怎么解!
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/27 09:20:15
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(a-1)(a²+a+1)怎么解!
(a-1)(a²+a+1)怎么解!
(a-1)(a²+a+1)怎么解!
(a-1)(a²+a+1)
=a³+a²+a-a²-a-1
=a³-1
(a-1)(a²+a+1)=a³-1
这是立方方差公式:a³-b³=(a-b)(a²+ab+b²)