(3a+1/2)^2*(3a-1/2)^2怎么算?

问题描述:

(3a+1/2)^2*(3a-1/2)^2怎么算?

(3a+1/2)^2*(3a-1/2)^2
=[(3a+1/2)*(3a-1/2)]^2
=(9a^2-1/4)^2