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Re:两个公式选一个

Posted by qidi at 2010-11-08 15:18:04 on Problem 1423
In Reply To:Re:两个公式选一个 Posted by:lihuiyykl at 2009-08-21 10:09:14 
> 哪位大牛帮忙证明一下，谢谢
n! = n*(n-1)*(n-2)....1
n!的位数=[log10(n!)]+1
        =[lon10(n*(n-1)*(n-2)....1)]
        =[log10(n)+log10(n-1)+....log10(1)]+1
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