Ответ:

  1. \(\sqrt{9\cdot36}=\sqrt{9}\cdot\sqrt{36}=3\cdot6=18\).
  2. \(\sqrt{25\cdot81}=5\cdot9=45\).
  3. \(\sqrt{16\cdot900}=4\cdot30=120\).
  4. \(\sqrt{2500\cdot49}=50\cdot7=350\).
  5. \(\sqrt{0.64\cdot25}=0.8\cdot5=4\).
  6. \(\sqrt{0.49\cdot16}=0.7\cdot4=2.8\).
  7. \(\sqrt{0.09\cdot0.25}=0.3\cdot0.5=0.15\).
  8. \(\sqrt{0.36\cdot1.44}=0.6\cdot1.2=0.72\).

Ответ: 1) 18; 2) 45; 3) 120; 4) 350; 5) 4; 6) 2,8; 7) 0,15; 8) 0,72.