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用乘法公式计算:(3a-2b)(9a^2+6ab+4b^2) (a-1)(a+1)(a^4+a^2+1)
1)(3a-2b)(9a^2+6ab+4b^2)
2)(a-1)(a+1)(a^4+a^2+1)
人气:171 ℃ 时间:2019-10-11 19:57:00
解答
(3a-2b)(9a^2+6ab+4b^2)
=(3a)³-(2b)³
=27a³-8b³
(a-1)(a+1)(a^4+a^2+1)
=(a²-1)(a^4+a^2+1)
=a^6-1
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