-2ab(3a^2-2ab-4b^2) (2b-a)b-(2a-b)a

问题描述:

-2ab(3a^2-2ab-4b^2) (2b-a)b-(2a-b)a
-2ab(3a^2-2ab-4b^2)
(2b-a)b-(2a-b)a

-2ab(3a^2-2ab-4b^2)
=-6a³b+4a²b²+8ab³
(2b-a)b-(2a-b)a
=2b²-ab-2a²+ab
=2b²-2a²