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

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

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

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

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

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