lim n→∞【1/(n²+1)+2/(n²+2²)+…+n/(n²+n²)=

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lim n→∞【1/(n²+1)+2/(n²+2²)+…+n/(n²+n²)=

lim n→∞【1/(n²+1)+2/(n²+2²)+…+n/(n²+n²)=
lim n→∞【1/(n²+1)+2/(n²+2²)+…+n/(n²+n²)=

lim n→∞【1/(n²+1)+2/(n²+2²)+…+n/(n²+n²)=