化简:(3a-2a^2)-[5a-1/3(6a^2-9a)-4a^2].去括号化简!

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化简:(3a-2a^2)-[5a-1/3(6a^2-9a)-4a^2].去括号化简!
化简:(3a-2a^2)-[5a-1/3(6a^2-9a)-4a^2].
去括号化简!

化简:(3a-2a^2)-[5a-1/3(6a^2-9a)-4a^2].去括号化简!

(3a-2a²)-[5a-1/3(6a²-9a)-4a²]
=3a-2a²-[5a-2a²+3a-4a²]
=3a-2a²-(8a-6a²)
=3a-2a²-8a+6a²
=(6a²-2a²)+(3a-8a)
=4a²-5a