(2+1/1²)+(2+1/2²)+...+(2+1/n²)=2n+(1/1²+1/2²+...+1/n²)>2nn趋向于正无穷大，2n趋向于正无穷大，2n+(1/1²+1/2²+...+1/n²)趋向于正无穷大。+∞∑(2+1/n²)=+∞n=1
为2
