11) \((\sqrt{32}-\sqrt{2})\cdot\sqrt{8}\)

Упростим корни: \(\sqrt{32}=4\sqrt{2}\), \(\sqrt{8}=2\sqrt{2}\).

\((4\sqrt{2}-\sqrt{2})\cdot2\sqrt{2}=3\sqrt{2}\cdot2\sqrt{2}=12\).

Ответ: 12.