(3a+1)(2a-3)-6(a-1)(a+2)

问题描述:

(3a+1)(2a-3)-6(a-1)(a+2)

(3a+1)(2a-3)-6(a-1)(a+2)
=6a^2-7a-3-6(a^2+a-2)
=6a^2-7a-3-6a^2-6a+12
=-13a+9