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令-15*(5/6)^(n-1)+1≥0得(5/6)^(n-1)≤1/15.方程(5/6)^(n-1)=1/15兩邊取對數得n-1=lg(1/15)/lg(5/6)=lg15/(lg6-lg5)將lg2≈0.3010,lg3≈0.4771代入得n≈15.9,這就是說,從第16項開始為正項,而前15…
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