回報的期待值是多少？

所有跟帖： 

• F(y)=[100xy+(100-y)(x*y+100)+(100-y)/2]/100,y=(100x-100)/2x -jinjing- ♀ (42 bytes) () 05/10/2010 postreply 17:22:07

• 算我懶 -guest007- ♀ (137 bytes) () 05/10/2010 postreply 17:52:37

• 1)x=2,F(75)=237.5,x=1,F(50)=125,x=.8,F(38)=110.2)x=2,F(75)=248.7 -Jinjing- ♀ (111 bytes) () 05/10/2010 postreply 20:36:55

• 謝謝- 還可以更高 -guest007- ♀ (13 bytes) () 05/11/2010 postreply 06:53:37

• You want to peep? -jinjing- ♀ (0 bytes) () 05/11/2010 postreply 09:54:23

• peep tile win, then start sell -guest007- ♀ (6 bytes) () 05/12/2010 postreply 06:14:27