回複：鴨在半徑為x 的圓上與狐周旋於同一直徑遠端，不可能.

來源: guest007 於 2010-05-15 21:26:51 [檔案] [舊帖] [給我悄悄話] 閱讀數 : (64 bytes)

回答: I mean vf is larger than that, the duck still can free 由 guest007 於 2010-05-14 14:23:47

never mind- correct answer has been posted - let's move on then

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