因式分解(3m+n)(2m-n)-(m+3n)(n-2m)
人气:243 ℃ 时间:2019-12-09 23:25:52
解答
(3m+n)(2m-n)-(m+3n)(n-2m)
=(3m+n)(2m-n)+(m+3n)(2m-n)
=(2m-n)(3m+n+m+3n)
=4(m+n)(2m-n)
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