(a²+2ab+3b²)·2ab,(a²+2ab+3b²)·2ab,怎么算都感觉有一步错了,
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(a²+2ab+3b²)·2ab,(a²+2ab+3b²)·2ab,怎么算都感觉有一步错了,
(a²+2ab+3b²)·2ab,
(a²+2ab+3b²)·2ab,怎么算都感觉有一步错了,
(a²+2ab+3b²)·2ab,(a²+2ab+3b²)·2ab,怎么算都感觉有一步错了,
(a²+2ab+3b²)·2ab
=2a³b+4a²b²+6ab³
=2a^3b+4a^2b^2+6ab^3