(a²-3a-1)+A=a²-a+4
A=(a²-a+4)-(a²-3a-1)
=a²-a+4-a²+3a+1
=(a²-a²)+(-a+3a)+(4+1)
=2a+5
則A=2a+5
若（a的2次冪-3a-1）+A=a的2次冪-a+4,則A=______
若（a的2次冪-3a-1）+A=a的2次冪-a+4,則A=______
數(shù)學(xué)人氣：216 ℃時間：2020-06-03 14:32:01
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