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化简:3a-{-2b[a-(4a+3b)]}
人气:448 ℃ 时间:2020-01-14 16:35:23
解答
3a-{-2b[a-(4a+3b)]}
=3a-{-2b[a-4a-3b]}
=3a-{-2b[-3a-3b]}
=3a-{6ab+3b²}
=3a-6ab-3b²
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