1x2x3x4x5x...x2006x2007
要有0就要有2x5
2一定多過5
所以有x個5就會有x個0
每5個數就有1個5,每5^2個數就有多1個5,每5^3個數就有多1個5............
[2007/5]+[2007/5^2]+[2007/5^3]+[2007/5^4]-----[x]是x的整體部份
=401+80+16+3
=500
有500個0
我個回答只係計尾個D冇計到前面個D
參考資料:
http://hk.knowledge.yahoo.com/question/?qid=7007020704102
回答者 :evil_angel1029 [小學級 5 級]
回答時間:2007-03-20 21:18:35 檢舉
2007! = 1 x 2 x 3 ... x 2005 x 2006 x 2007 = 4.3 x 10^5758
In mathematics, the factorial of a positive integer n is the product of all positive integers less than or equal to n. This is written as n! and pronounced "n factorial", or colloquially "n shriek", "n bang" or "n crit".
http://en.wikipedia.org/wiki/Factorial
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