3(m^2n+mn)-4(mn-2m^2n)+mn.
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人气：275 ℃ 时间：2020-05-18 23:57:53
解答
3(m^2n+mn)-4(mn-2m^2n)+mn.
= 3m^2n+3mn-4mn+8m^2n+mn.
= 11m^2n.
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