\[\boxed{\mathbf{540\ (540).\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1){\ \left( 2 + \sqrt{7} \right)}^{2} - 4\sqrt{7} =\]
\[= 4 + 4\sqrt{7} + 7 - 4\sqrt{7} = 11;\]
\[2)\ \left( \sqrt{6} - \sqrt{3} \right)² + 6\sqrt{2} =\]
\[= 6 - 2\sqrt{18} + 3 + 6\sqrt{2} =\]
\[= 6 - 6\sqrt{2} + 3 + 6\sqrt{2} = 9.\]