计算.(1)(a-2b+3c)2-(a+2b-3c)2;(2)[ab(3?b)?2a(b?12b

发布时间:2021-03-10 02:05:34

计算.(1)(a-2b+3c)2-(a+2b-3c)2;(2)[ab(3?b)?2a(b?12b

网友回答

(1)(a-2b+3c)2-(a+2b-3c)2=(a-2b+3c+a+2b-3c)(a-2b+3c-a-2b+3c)=2a?(-4b+6c)=12ac-8ab;
(2)[ab(3?b)?2a(b?12b
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