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| 从“∑”到“∑∑…∑” | |
| 摘 要： | 大家熟知sum form i=1 to ni=1/2 n(n+1) (*) 但sum form n_1=1 to n sum form i=1 to n_1i=?更一般地sum form n_(m-1)=1 to n sum form n_(m-z)=1 to n_(m-1)…sum form n_1=1 to n_2 sum form i=1 to n_1i=? sum form n_(m-1)=1 to n sum form n_(m-z)=1 to n_(m-1) |
| 本文献已被 CNKI 等数据库收录！ | |