(2a-b)(2a+1/3)=4a^2-1/9,则b=_

问题描述:

(2a-b)(2a+1/3)=4a^2-1/9,则b=_

(2a-b)(2a+1/3)
=4a^2-1/9
=(3a-1/3)(2a+1/3)
所以b=1/3