\[\boxed{\mathbf{1122}\mathbf{\text{.\ }}Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ \left( \sqrt{80} - \sqrt{45} \right) \cdot \sqrt{5} =\]
\[= \sqrt{400} - \sqrt{225} = 20 - 15 = 5\]
\[2)\ \left( 2\sqrt{6} + \sqrt{54} - \sqrt{96} \right) \cdot \sqrt{6} =\]
\[= 2 \cdot 6 + \sqrt{324} - \sqrt{576} =\]
\[= 12 + 18 - 24 = 6\]
\[3)\ \left( 12 - \sqrt{10} \right)\left( 3 + \sqrt{10} \right) =\]
\[= 36 - 3\sqrt{10} + 12\sqrt{10} - 10 =\]
\[= 26 + 9\sqrt{10}\]
\[4)\ \left( 2\sqrt{5} + \sqrt{7} \right)\left( 2\sqrt{7} - \sqrt{5} \right) =\]
\[= 4\sqrt{35} + 14 - 10 - \sqrt{35} =\]
\[= 4 + 3\sqrt{35}\]
\[5)\ \left( \sqrt{19} - \sqrt{13} \right)\left( \sqrt{19} + \sqrt{13} \right) =\]
\[= 19 - 13 = 6\]
\[6)\ \left( 4\sqrt{m} + 9\sqrt{n} \right)\left( 4\sqrt{m} - 9\sqrt{n} \right) =\]
\[= 16m - 81n\]
\[7)\ \left( \sqrt{5x} + \sqrt{11y} \right)^{2} =\]
\[= 5x + 2\sqrt{55xy} + 11y\]
\[8)\ \left( 3\sqrt{11} - 2\sqrt{10} \right)^{2} =\]
\[= 99 - 12\sqrt{110} + 40 =\]
\[= 139 - 12\sqrt{110}\]