计算:9m的平方/-3m-n + n的平方/n+3m
问题描述:
计算:9m的平方/-3m-n + n的平方/n+3m
答
9m^2/(-3m-n)+n^2/(n+3m)=(3m)^2/-(3m+n)+n^2/(n+3m)=(n^2-(3m)^2)/(n+3m)=(n+3m)(n-3m)/(n+3m)=n-3m
计算:9m的平方/-3m-n + n的平方/n+3m
9m^2/(-3m-n)+n^2/(n+3m)=(3m)^2/-(3m+n)+n^2/(n+3m)=(n^2-(3m)^2)/(n+3m)=(n+3m)(n-3m)/(n+3m)=n-3m