(49/50 + 1/50/50) * (48/49 + 1/49/49) ....*(1/2 + 1/2/2)

来源: jjmmjj 于 2009-07-09 18:57:05 [档案] [旧帖] [给我悄悄话] 阅读数 : (0 bytes)

回答: 回复：世界大学生奥赛题：坐飞机（2.5星）由 jjmmjj 于 2009-07-03 06:30:33

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