09 2025 档案

PRISMS Junior Varsity Training 20250919
摘要：Problem 1 Find all the roots of equation \(2x-2.8=\lfloor x\rfloor\). Solution 1 \[\begin{align} 2x-2.8=\lfloor x\rfloor&\Longrightarrow x-1<2x-2.8\le 阅读全文
posted @ 2025-09-24 07:43 Apteryxx 阅读(18) 评论(0) 推荐(1)
PRISMS Senior Varsity Training 20250915
摘要：Problem 1 (2013 PUMaC, Number Theory Problem 2) Find the smallest \(n\) such that \(2013^n\) ends in \(001\). Solution 1 It is easy to prove that the 阅读全文
posted @ 2025-09-23 20:33 Apteryxx 阅读(30) 评论(0) 推荐(1)