T
transformers123


Tình tổng:
$$\sqrt{1+\dfrac{1}{1^2}+\dfrac{1}{2^2}}+\sqrt{1 + \dfrac{1}{2^2} + \dfrac{1}{3^2}}+\sqrt{1+\dfrac{1}{3^2}+\dfrac{1}{4^2}}+...+\sqrt{1+\dfrac{1}{2012^2} + \dfrac{1}{2013^2}}$$
$$\sqrt{1+\dfrac{1}{1^2}+\dfrac{1}{2^2}}+\sqrt{1 + \dfrac{1}{2^2} + \dfrac{1}{3^2}}+\sqrt{1+\dfrac{1}{3^2}+\dfrac{1}{4^2}}+...+\sqrt{1+\dfrac{1}{2012^2} + \dfrac{1}{2013^2}}$$