化简:3a²-[7a-3(4a-3)-2a²]
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化简:3a²-[7a-3(4a-3)-2a²]化简:3a²-[7a-3(4a-3)-2a²]化简:3a²-[7a-3(4a-3)-2a²]3
化简:3a²-[7a-3(4a-3)-2a²]
化简:3a²-[7a-3(4a-3)-2a²]
化简:3a²-[7a-3(4a-3)-2a²]
3a²-[7a-3(4a-3)-2a²]
=3a²-(7a-12a+9-2a²)
=3a²+2a²+5a-9
=5a²+5a-9