数学竞赛一天一题 3/13/2014

所有跟帖： 

• 15？ -云逸徉- ♂ (0 bytes) () 03/13/2014 postreply 11:24:05

• 正确，发小红花一朵 -sudo- ♂ (139 bytes) () 03/13/2014 postreply 11:33:29

• 我用Excel计算的。作弊。 -云逸徉- ♂ (0 bytes) () 03/13/2014 postreply 11:38:58

• Proof of the formula -dr_yin- ♂ (160 bytes) () 03/13/2014 postreply 12:33:20

• smart way. 其它都能凑到100. -ca981- ♂ (0 bytes) () 03/13/2014 postreply 12:00:32

• It is time to introduce kids basic modular arithmetic -dr_yin- ♂ (0 bytes) () 03/13/2014 postreply 12:37:43

• Summary of above two solutions -dr_yin- ♂ (79 bytes) () 03/13/2014 postreply 13:06:16

• 回复：Summary of above two solutions -drp- ♂ (375 bytes) () 03/13/2014 postreply 19:11:21

• Right. It needs more explanation.Especially the second part. -dr_yin- ♂ (79 bytes) () 03/13/2014 postreply 19:58:26

• 回复：Summary of above two solutions -drp- ♂ (375 bytes) () 03/13/2014 postreply 19:11:48

• yesterday's solution for mathcounts kids -calligraphy- ♂ (683 bytes) () 03/13/2014 postreply 13:20:26

• 欢乐的爸爸 gave a very good solution -flagsix- ♂ (0 bytes) () 03/13/2014 postreply 13:32:00

• 没错，如果熟悉Ceva's theorem的证明，从面积入手确实是最好的办法。 -calligraphy- ♂ (0 bytes) () 03/13/2014 postreply 13:43:29

• 他的方法没用Ceva's theorem，非常简单 -flagsix- ♂ (0 bytes) () 03/13/2014 postreply 14:29:51

• 回复：他的方法没用Ceva's theorem，非常简单 -dr_yin- ♂ (72 bytes) () 03/13/2014 postreply 18:59:05

• Not mine, It's from 欢乐的爸爸 in 数学启智，etc group -flagsix- ♂ (99 bytes) () 03/14/2014 postreply 07:00:10

• I like this solution -Dr_yin- ♂ (0 bytes) () 03/13/2014 postreply 17:33:44

• Ceva's Theorem -dr_yin- ♂ (79 bytes) () 03/13/2014 postreply 23:14:56