摘要: 原题链接:https://artofproblemsolving.com/community/c4h3685828_1000th_post P1 解法: 注意到有 \(\sum_{i=1}^n \frac{a_i}{s-a_i}=\sum_{i=1}^n\left(\frac{s}{b_i}-1\r 阅读全文
posted @ 2025-10-08 13:49 JMCE 阅读(11) 评论(1) 推荐(0)
摘要: 原题链接:https://artofproblemsolving.com/community/c4h3687790_1st_penchick_online_mathematical_olympiad_qualifying_test_1_iii4 解答: 令 , . (统一分母)整理得:代入原式 均值 阅读全文
posted @ 2025-10-07 23:08 JMCE 阅读(16) 评论(2) 推荐(0)