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m+n=5,mn=14,则(3m-2n)-(-5n+mn)
人气：353 ℃ 时间：2019-09-17 08:21:21
解答
(3m-2n)-(-5n+mn)
=3m-2n+5n-mn
=3m+3n-mn
=3(m+n)-mn
=3*5-14
=1
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