1/3ab+1/4a方-1/3a方-(-2/3ab)要过程

问题描述:

1/3ab+1/4a方-1/3a方-(-2/3ab)要过程

1/3ab+1/4a方-1/3a方-(-2/3ab)
=1/3ab+1/4a²-1/3a²+2/3ab
=(1/4-1/3)a²+(1/3+2/3)ab
=-1/12a²+ab