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(3)3M-[2N-(2M-3N)-N]
人气：352 ℃ 时间：2020-04-18 13:18:25
解答
3M-[2N-(2M-3N)-N]
=3M-(2N-2M+3N-N)
=3M-(4N-2M)
=3M-4N+2M
=5M-4N
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