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