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| 1. |
\begin{array}{l}{3+\frac{1}{\sqrt{4}-\sqrt{5}}+\frac{1}{\sqrt{5}-\sqrt{6}}+\frac{1}{\sqrt{6}+\sqrt{7}}+\frac{1}{\sqrt{7}+\sqrt{8}}} \\ {+\frac{1}{\sqrt{8}-\sqrt{9}}=?}\end{array} |
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