Ответ:

  1. \(\sqrt{6^4}=\sqrt{1296}=36\).
  2. \(\sqrt{9^3}=\sqrt{9^2\cdot9}=9\sqrt{9}=27\).
  3. \(\frac{(2\sqrt{10})^2}{160}=\frac{4\cdot10}{160}=\frac{1}{4}\).
  4. \(\frac{72}{(2\sqrt{3})^2}=\frac{72}{4\cdot3}=6\).

Ответ: 1) 36; 4) 27; 7) \(\frac{1}{4}\); 10) 6.