8m的2次方+【2m的2次方-m-(3m的2次方-4m)】

问题描述:

8m的2次方+【2m的2次方-m-(3m的2次方-4m)】
化简

8m^2+[2m^2-m-(3m^2-4m)]
=8m^2+2m^2-m-3m^2+4m
=(8+2-3)m^2+(-1+4)m
=7m^2+3m