L
luffy1412


$A=\frac{1}{\sqrt[2]{1}\sqrt[2]{2}}+\frac{1}{\sqrt[2]{2}\sqrt[2]{3}}+.....+\frac{1}{\sqrt[2]{2010}\sqrt[2]{2011}}+\frac{1}{\sqrt[2]{2011}\sqrt[2]{2012}}$
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