化简:3a^2-[5a-(1/2a-3)+2a^2]
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化简:3a^2-[5a-(1/2a-3)+2a^2]
化简:3a^2-[5a-(1/2a-3)+2a^2]
化简:3a^2-[5a-(1/2a-3)+2a^2]
3a^2-[5a-(1/2a-3)+2a^2]
=3a²-(5a-1/2a+3+2a²)
=3a²-2a²-4.5a-3
=a²-4.5x-3
3a^2-[5a-(1/2a-3)+2a^2]=3a^2-2a^2-9/2a-3=a^2-4.5a-3
希望这个问题不要让你为之憔悴
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