[Everyday Mathematics]20150116
2015-01-06 16:17
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设 $\al_n\geq 0$ 且 $\dps{\vlm{n}\al_n=0}$, 试求 $$\bex \vlm{n}\frac{1}{n}\sum_{k=1}^n \ln\sex{\frac{k}{n}+\al_n}. \eex$$
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