中四附加數
回答 (1)
2007-09-13 6:01 am
✔ 最佳答案
100! = 1x2x3x...x100=(1x3x5x...x97x99)x(2x4x6x...x98x100)
=(1x3x5x...x97x99)x[(2x1)x(2x2)x(2x3)x...x(2x49)x(2x50)]
=(1x3x5x...x97x99)x2^50x(1x2x3x...x49x50)
=2^50(1x3x5x...x97x99)50!
參考: me
收錄日期: 2021-04-13 18:12:13
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070912000051KK04398