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利用stolz定理,是最簡單的做法 結論是明顯的~ 如果不用stolz定理,做法其實也不難~ lim(n→∞)a(n+1)/a(n)=a 根據定義: 對任意ε>0,存在N>0,當N>N,就有a(n+1)/a(n)-a
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