:(3a^n+2+6a^n+1-9a^n)÷3a^n-1
=3a^n+2÷3a^n-1+6a^n+1÷3a^n-1-9a^n ÷3a^n-1
=a³+2a²-3a
计算:(3a^n+2+6a^n+1-9^n)÷3a^n-1
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