Ответ:

  1. \(\sqrt{75\cdot48}=\sqrt{3600}=60\).
  2. \(\sqrt{45\cdot80}=\sqrt{3600}=60\).
  3. \(\sqrt{4{,}9\cdot360}=\sqrt{1764}=42\).
  4. \(\sqrt{160\cdot6{,}4}=\sqrt{1024}=32\).