化简(a²+5a)-2(1/2a²-4a)急用= =
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化简(a²+5a)-2(1/2a²-4a)急用= =
化简(a²+5a)-2(1/2a²-4a)
急用= =
化简(a²+5a)-2(1/2a²-4a)急用= =
(a²+5a)-2(1/2a²-4a)
=a²+5a-a²+8a
=(1-1)a²+(5+8)a
=13a
=a²+5a-a²+8a
=13a