计算(9m^2/-3m-n)+n^2/n+3m 一定要

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计算(9m^2/-3m-n)+n^2/n+3m一定要计算(9m^2/-3m-n)+n^2/n+3m一定要计算(9m^2/-3m-n)+n^2/n+3m一定要9m^2/-3m-n+n^2/n+3m=-9

计算(9m^2/-3m-n)+n^2/n+3m 一定要
计算(9m^2/-3m-n)+n^2/n+3m 一定要

计算(9m^2/-3m-n)+n^2/n+3m 一定要
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

9m^2/(-3m-n)+n^2/(n+3m)
=-9m^2/(3m+n)+n^2/(n+3m)
=n^2/(n+3m) -9m^2/(3m+n)
=(n^2 -9m^2)/(3m+n)
=(n -3m)(n+3m)/(3m+n)
=n-3m