這些集合並沒有問題,它們是N+1匹馬的兩個子集。
所有跟帖:
• 這兩個子集不是題目裏的集。 -cantorian- ♀ (142 bytes) () 08/25/2012 postreply 22:19:22
• 這兩個子集不是題目裏的集。 -cantorian- ♀ (142 bytes) () 08/25/2012 postreply 22:19:22
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