I can verify it by Analitical Geo.Easy but boring.

來源: jinjing 於 2010-09-15 19:19:35 [檔案] [舊帖] [給我悄悄話] 閱讀數 : (66 bytes)

回答: 是的，在三維情形裏它可能是相當簡單的一道題，盡管... 由與數學無關於 2010-09-15 18:26:07

If you are intresting,let me know...I have do something right now.

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