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這不應該是函數,而應該是數列an=(-1)^n 沒有極限 因為 存在子列ai=(-1)^2i=1,且lim ai=1 子列aj=(-1)^(2j+1)=-1,且lim aj=-1 囙此對於數列an存在兩個極限值不相同的子列 故,lim an不存在 有不懂歡迎追問
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