7a²-(5a²-2b)+4a(2a²-3b)化简
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7a²-(5a²-2b)+4a(2a²-3b)化简7a²-(5a²-2b)+4a(2a²-3b)化简7a²-(5a²-2
7a²-(5a²-2b)+4a(2a²-3b)化简
7a²-(5a²-2b)+4a(2a²-3b)化简
7a²-(5a²-2b)+4a(2a²-3b)化简
7a²-(5a²-2b)+4a(2a²-3b)
=7a²-5a²+2b+8a³-12ab
=8a³+2a²-12ab+2b
=2a²-5b+8a^3