Ответ:

  1. \(\sqrt{72}\cdot\sqrt{2}=\sqrt{144}=12\).

  2. \(\sqrt{45}\cdot\sqrt{5}=\sqrt{225}=15\).

  3. \(\sqrt{360}\cdot\sqrt{490}=\sqrt{176400}=420\).

  4. \(\sqrt{0.9}\cdot\sqrt{1.6}=\sqrt{1.44}=1.2\).

  5. \(\frac{\sqrt{242}}{\sqrt{2}}=\sqrt{121}=11\).

  6. \(\frac{\sqrt{40}}{\sqrt{0.025}}=\sqrt{\frac{40}{0.025}}=\sqrt{1600}=40\).

Ответ: 1) 12; 2) 15; 3) 420; 4) 1,2; 5) 11; 6) 40.