\[\boxed{\mathbf{537\ (537).\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ \sqrt{7} \cdot \left( \sqrt{7} - \sqrt{28} \right) =\]
\[= \sqrt{49} - \sqrt{196} = 7 - 14 = - 7;\]
\[2)\ \left( \sqrt{18} + \sqrt{72} \right) \cdot \sqrt{2} =\]
\[= \sqrt{36} + \sqrt{144} = 6 + 12 = 18;\]
\[3)\ \left( 4\sqrt{3} - \sqrt{75} + 4 \right) \cdot 3\sqrt{3} =\]
\[= \left( 4\sqrt{3} - 5\sqrt{3} + 4 \right) \cdot 3\sqrt{3} =\]
\[= \left( - \sqrt{3} + 4 \right) \cdot 3\sqrt{3} =\]
\[= - 3\sqrt{9} + 12\sqrt{3} = - 9 + 12\sqrt{3};\]
\[4)\ \left( \sqrt{600} + \sqrt{6} - \sqrt{24} \right) \cdot \sqrt{6} =\]
\[= \left( 10\sqrt{6} + \sqrt{6} - 2\sqrt{6} \right) \cdot \sqrt{6} =\]
\[= 9\sqrt{6} \cdot \sqrt{6} = 54.\]