已知A=-4³-3+2a²+5a,B=3a³-a-a²,求A-2B
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已知A=-4³-3+2a²+5a,B=3a³-a-a²,求A-2B
已知A=-4³-3+2a²+5a,B=3a³-a-a²,求A-2B
已知A=-4³-3+2a²+5a,B=3a³-a-a²,求A-2B
A=-4³-3+2a²+5a=-64-3+2a²+5a=2a²+5a-67
B=3a³-a-a²=3a³-a²-a
A-2B
=2a²+5a-67-2(3a³-a²-a)
=2a²+5a-67-6a³+2a²+2a
=-6a³+2a²+2a²+5a+2a-67
=-6a³+4a²+7a-67