\[\sqrt{2} + \sqrt{3}\ и\ \sqrt{5}\ \]
\[\left( \sqrt{2} + \sqrt{3} \right)^{2} = 2 + 2\sqrt{6} + 3 =\]
\[= 5 + 2\sqrt{6}\]
\[\left( \sqrt{5} \right)^{2} = 5\]
\[5 + 2\sqrt{6} > 5\]
\[\Longrightarrow \sqrt{2} + \sqrt{3} > \sqrt{5}.\]