1. Вычислите: \((\sqrt{72}-\sqrt{8})\cdot3\sqrt{2}\).

\(\sqrt{72}=6\sqrt{2}\), а \(\sqrt{8}=2\sqrt{2}\).

\((6\sqrt{2}-2\sqrt{2})\cdot3\sqrt{2}=4\sqrt{2}\cdot3\sqrt{2}=12\cdot2=24\).

Ответ: 24.