Ответ:

  1. \(\sqrt{2}\cdot\sqrt{32}=\sqrt{64}=8\).
  2. \(\sqrt{10}\cdot\sqrt{90}=\sqrt{900}=30\).
  3. \(\sqrt{3}\cdot\sqrt{7}\cdot\sqrt{21}=\sqrt{441}=21\).
  4. \(\sqrt{2}\cdot\sqrt{22}\cdot\sqrt{11}=\sqrt{484}=22\).
  5. \(\sqrt{\frac{1}{2}\cdot\frac{2}{3}\cdot3}=\sqrt{1}=1\).
  6. \(\sqrt{\frac{2}{5}\cdot\frac{5}{7}\cdot\frac{7}{8}}=\sqrt{\frac14}=\frac12\).

Ответ: 1) 8; 2) 30; 3) 21; 4) 22; 5) 1; 6) \(\frac12\).