Ответ:
\[\left( 5\sqrt{2} + 6\sqrt{3} \right)\left( 6\sqrt{2} - 5\sqrt{3} \right) =\]

\[= 60 + 11\sqrt{6} - 90 = 11\sqrt{6} - 30\]
\[\left( 5\sqrt{2} + 6\sqrt{3} \right)\left( 6\sqrt{2} - 5\sqrt{3} \right) =\]

\[= 60 + 11\sqrt{6} - 90 = 11\sqrt{6} - 30\]