brother, you are too careless,they should be:

來源: jinjing 於 2010-08-26 16:00:09 [] [舊帖] [給我悄悄話] 閱讀數 : (148 bytes)

which is bigger,y or (xd)^2. If the room is rectangle floor
...............y or x^2*z^2*d^2,If room is circle floor...It is interesting question.

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• I am totally wrong -jinjing- ♀ 給 jinjing 發送悄悄話 (0 bytes) () 08/26/2010 postreply 17:10:58

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