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(3a+1)(2a-3)-(4a-5)(a-4)计算
人气:334 ℃ 时间:2019-12-08 07:45:32
解答
(3a+1)(2a-3)-(4a-5)(a-4)
=6a²+2a-9a-3-(4a²-5a-16a+20)
=6a²-7a-3-4a²+21a-20
=2a²+14a-23
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