计算-(2a²+5)-(3a²-2)-2(-4a²-1)
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计算-(2a²+5)-(3a²-2)-2(-4a²-1)计算-(2a²+5)-(3a²-2)-2(-4a²-1)计算-(2a²+5
计算-(2a²+5)-(3a²-2)-2(-4a²-1)
计算-(2a²+5)-(3a²-2)-2(-4a²-1)
计算-(2a²+5)-(3a²-2)-2(-4a²-1)
-(2a²+5)-(3a²-2)-2(-4a²-1)
=-2a²-5-3a²+2+8a²+2
=3a²-1
a2-1
-2a²-5-3a²+2+8a²+2=3a²-1