(3a^n+2 + a^n+1)/(-3/1a^n-1)=?
2个回答
(3a^n+2 + a^n+1)/(-3/1a^n-1)
=a^n-1(3a^3 + a^2)/(-3/1a^n-1)
=-3(3a^3 + a^2)
=-9a^3 - 3a^2
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