3(a^2-2ab)-2(-3ab-b^2)3a^2-[a^2+(4a^2-2a)-2(a^2-3a_]

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3(a^2-2ab)-2(-3ab-b^2)3a^2-[a^2+(4a^2-2a)-2(a^2-3a_]

3(a^2-2ab)-2(-3ab-b^2)3a^2-[a^2+(4a^2-2a)-2(a^2-3a_]
3(a^2-2ab)-2(-3ab-b^2)
3a^2-[a^2+(4a^2-2a)-2(a^2-3a_]

3(a^2-2ab)-2(-3ab-b^2)3a^2-[a^2+(4a^2-2a)-2(a^2-3a_]
3(a²-2ab)-2(-3ab-b²)
=3a²-6ab+6ab+2b²
=3a²+2b²
3a²-[a²+(4a²-2a)-2(a²-3a_]
=3a²-[a²+4a²-2a-2a²+6a]
=3a²-a²-4a²+2a+2a²-6a
=-4a

3(a^2-2ab)-2(-3ab-b^2) =3a^2+4b^2
3a^2-[a^2+(4a^2-2a)-2(a^2-3a)]=-4a

要干什么??
3(a^2-2ab)-2(-3ab-b^2)
=3a^2-6ab+6ab+2b^2
=3a^2+2b^2
3a^2-[a^2+(4a^2-2a)-2(a^2-3a)]
=3a^2-(a^2+4a^2-2a-2a^2+6a)
=3a^2-a^2-4a^2+2a+a^2-6a
=-4a

兄弟。你别告诉我要人家求a、b…
你这根本不是等式,求个毛…
如果是化简…闭着眼睛都能解出来。。

3(a^2-2ab)-2(-3ab-b^2)
=3a^2-6ab+6ab+2b^2
=3a^2+2b^2

3a^2-[a^2+(4a^2-2a)-2(a^2-3a)]
=3a^2-(a^2+4a^2-2a-2a^2+6a)
=3a^2-(3a^2+4a)
=3a^2-3a^2-4a
=-4a