(x-y/3)^2-(x+y/3)^2因式分解

问题描述:

(x-y/3)^2-(x+y/3)^2因式分解

(x-y/3)^2-(x+y/3)^2
=X^2-2XY/3+Y^2/9-X^2-2XY/3-Y^2*9
=-4XY/3