计算:(1)1/3ab-3ab-1 (2)6a^2-2ab+2(3a^2-1/2ab).

问题描述:

计算:(1)1/3ab-3ab-1 (2)6a^2-2ab+2(3a^2-1/2ab).

1/3ab-3ab-1 =-8/3ab-1
6a^2-2ab+2(3a^2-1/2ab)=6a^2-2ab+6a^2-ab=12a^2-3ab

1).-8/3ab-1;2)12a^2-3ab

(1)1/3ab-3ab-1
=-2又2/3ab-1
(2)6a^2-2ab+2(3a^2-1/2ab)
=6a^2-2ab+6a^2-ab
=12a^2-3ab