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貌似我交的就是这个啊………………In Reply To:sum{(-1)^(m-k)*c(m,k)*k*(k-1)^(n-1)} (1<=k<=m) Posted by:windy7926778 at 2007-11-18 14:20:26 -_- 看来写rz了…… Followed by: Post your reply here: |
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