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计算(9m^2/-3m-n)+n^2/n+3m 一定要
人气:280 ℃ 时间:2020-01-27 02:19:50
解答
9m^2/-3m-n+n^2/n+3m
=-9m^2/n+3m +n^2/n+3m
=(n^2-9m^2)/n+3m
=(n+3m)(n-3m)/n+3m
=n-3m
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