4a^2b-[3ab^2-2(3a^2b-1)]
=4a^2b-3ab^2+6a^2b-2
=10a^2b-3ab^2-2
把A B的值代入 得到
原式=10*（-0.1）^2-3(-0.1）*1^2-2
=0.1+0.3-2
=-1.6