Ответ:

  1. \(\frac{\sqrt{12}}{\sqrt{3}}=\sqrt{\frac{12}{3}}=\sqrt{4}=2\).
  2. \(\sqrt{1{,}2}\cdot\sqrt{0{,}3}=\sqrt{1{,}2\cdot0{,}3}=\sqrt{0{,}36}=0{,}6\).
  3. \(\frac{\sqrt{2{,}7}}{\sqrt{0{,}3}}=\sqrt{\frac{2{,}7}{0{,}3}}=\sqrt{9}=3\).
  4. \(\sqrt{14}\cdot\sqrt{56}=\sqrt{14\cdot56}=\sqrt{784}=28\).