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[组合] 分享平方和級數公式與排列組合的關係

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tommywong posted 2020-4-30 08:33 |Read mode
94522593_10219868055684426_974227397391941632_n.jpg
若此方法推廣至立方和或任意階的求和可能會更有價值,
個人認為"2男1女數字皆不同,且2男的號碼為3數字中最大與最小"難以從理論上解釋。
现充已死,エロ当立。
维基用户页:https://zh.wikipedia.org/wiki/User:Tttfffkkk
Notable algebra methods:https://artofproblemsolving.com/community/c728438
《方幂和及其推广和式》 数学学习与研究2016.

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