2394| 1
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[不等式] 求$\sum\frac{1}{a_1+2a_2+\dots+na_n}$最大值 |
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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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2025-7-15 15:09 GMT+8
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