当a=1,则6a^2-2ab-2(3a^2+1/2ab)=
问题描述:
当a=1,则6a^2-2ab-2(3a^2+1/2ab)=
答
6a^2-2ab-2(3a^2+1/2ab)
=6a^2-2ab-6a^2-ab
=-3ab
=-3b