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4Â¥: Originally posted by tclzxb at 2014-10-25 14:48:55
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tclzxb(feixiaolin´ú·¢): ½ð±Ò+4 2014-10-25 16:10:04
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Áîy=(1+1/3)(1+1/3^3)(1+1/3^5)......(1+1/3^(2n-1))*...... ,
Lny=SUM{Ln[1+1/3^(2*n-1)],n=1~¡Þ}
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tclzxb

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3Â¥: Originally posted by Edstrayer at 2014-10-25 04:03:44
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x_n=(1+\frac{1}{3})(1+\frac{1}{3^3})\cdots(1+\frac{1}{3^{2n-1}})=\prod\limits_{k=1}^n(1+\frac{1}{3^{2k-1}})
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\ln x_n=\sum\limits_{k=1}^n\ln(1+\frac{1}{3^{2k-1}})
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