:n为正整数,求证,n!的1/n次≤根号下1/6(n+1)(3n^2-n+1)

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:n为正整数,求证,n!的1/n次≤根号下1/6(n+1)(3n^2-n+1)

:n为正整数,求证,n!的1/n次≤根号下1/6(n+1)(3n^2-n+1)
:n为正整数,求证,n!的1/n次≤根号下1/6(n+1)(3n^2-n+1)

:n为正整数,求证,n!的1/n次≤根号下1/6(n+1)(3n^2-n+1)