帮忙做下(2a+1)(3a+1)—3a(2-3)对不起,我输错了,是(2a+1)(3a-1)—3a(2-3)

问题描述:

帮忙做下(2a+1)(3a+1)—3a(2-3)
对不起,我输错了,是
(2a+1)(3a-1)—3a(2-3)