计算:-2a^n(3a^(n+1)+4a-1)=
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计算:-2a^n(3a^(n+1)+4a-1)=
计算:-2a^n(3a^(n+1)+4a-1)=
计算:-2a^n(3a^(n+1)+4a-1)=
原式=-6a^(2n+1)-8a^(n+1)+2a^n
分式 计算:a^(2n+1)-6a^(2n)+9a^(2n-1) / a^(n+1)-4a^n+3a^(n-1)
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计算:-2a^n(3a^(n+1)+4a-1)=
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