(49/50 + 1/50/50) * (48/49 + 1/48/48) ....*(1/2 + 1/2/2)
correction
所有跟帖:
• (49/50 + 1/50/50) * (48/49 + 1/49/49) ....*(1/2 + 1/2/2) -jjmmjj- ♂ (0 bytes) () 07/09/2009 postreply 18:57:05
(49/50 + 1/50/50) * (48/49 + 1/48/48) ....*(1/2 + 1/2/2)
• (49/50 + 1/50/50) * (48/49 + 1/49/49) ....*(1/2 + 1/2/2) -jjmmjj- ♂ (0 bytes) () 07/09/2009 postreply 18:57:05
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