回复：回复：回复：回复：让人烦恼的礼金卡问题

I think your formula has a typo. instead, it should be:
ExpectReturn(1) = max (t*(1-t) + t*0.9ExpectReturn(1))

所有跟帖： 

• 回复：回复：回复：回复：回复：让人烦恼的礼金卡问题 -chivalryman- ♂ (17 bytes) () 03/12/2010 postreply 23:52:17