计算a^n(a^n+1+a^n+a^n-1)-a^n-1(a^n+1+a^n-a^n-1)
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计算a^n(a^n+1+a^n+a^n-1)-a^n-1(a^n+1+a^n-a^n-1)计算a^n(a^n+1+a^n+a^n-1)-a^n-1(a^n+1+a^n-a^n-1)计算a^n(a^n+
计算a^n(a^n+1+a^n+a^n-1)-a^n-1(a^n+1+a^n-a^n-1)
计算a^n(a^n+1+a^n+a^n-1)-a^n-1(a^n+1+a^n-a^n-1)
计算a^n(a^n+1+a^n+a^n-1)-a^n-1(a^n+1+a^n-a^n-1)
原式=3a^2n-a^n-a^n
=3a^2n-2a^n
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