Ответ:

  1. \(\sqrt2\cdot\sqrt{32}=\sqrt{64}=8\).
  2. \(\sqrt{10}\cdot\sqrt{40}=\sqrt{400}=20\).
  3. \((\sqrt{5{,}6})^2=5{,}6\).
  4. \(\sqrt{(-1{,}5)^2}=|-1{,}5|=1{,}5\).
  5. \(\sqrt{6^4}=6^2=36\).
  6. \(\sqrt{2^6\cdot3^4}=2^3\cdot3^2=72\).

Ответ: 8; 20; 5,6; 1,5; 36; 72.