【例1.68】lim_(ntoinfty)((1)/(n^2)+n+1+(2)/(n^2)+n+2+...+(n)/(n^2)+n+n)=().

【例1.68】$\lim_{n\to\infty}\left(\frac{1}{n^{2}+n+1}+\frac{2}{n^{2}+n+2}+\cdots+\frac{n}{n^{2}+n+n}\right)=\left(\right).$

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