數學是挑戰也是娛樂
數學家的觀點——丘成桐論《中國高等教育》2019 年6月11 日,丘成桐先生在于清華大學舉辦的第八屆世界華人數學家大會(ICCM ...
2009 USAMO Problems真題及答案 完整版真題免費下載 +答案解析請參考文末 真題下載請前往【純真題】小程序 Day 1 Problem 1 Given circles??and??intersecting at points??and?, let??be a line through the cent...
2010 USAMO Problems真題及答案 完整版真題免費下載 +答案解析請參考文末 Day 1 Problem 1 Let??be a convex pentagon inscribed in a semicircle of diameter?. Denote by?,?,?,??the feet of the perpendicular...
2011 USAMO Problems真題及答案 完整版真題免費下載 +答案解析請參考文末 Day 1 Problem 1 Let?,?,??be positive real numbers such that?. Prove that Problem 2 An integer is assigned to each vertex ...
2010 USAJMO Problems真題及答案 完整版真題免費下載 +答案解析請參考文末 Day 1 Problem 1 A permutation of the set of positive integers??is a sequence??such that each element of??appears precisely one ...
2011 USAJMO Problems真題及答案 完整版真題免費下載 +答案解析請參考文末 Day 1 Problem 1 Find, with proof, all positive integers??for which??is a perfect square. Problem 2 Let?,?,??be positive real nu...
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