Ответ:

  1. \(0{,}5\sqrt{3600}-\frac16\sqrt{81}=0{,}5\cdot60-\frac1635=30-5=25.\)

  2. \(\sqrt{0{,}25\cdot121}=\sqrt{\frac14\cdot121}=\frac{11}{2}=5{,}5.\)

  3. \(\sqrt{6^2\cdot2^8}=6\cdot2^4=96.\)

  4. \(\sqrt{20\sqrt{500}}-\frac{\sqrt{48}}{\sqrt3}=\sqrt{20\cdot10\sqrt5}-4=\sqrt{200\sqrt5}-4.\)

Ответ: 1) 25; 2) 5,5; 3) 96; 4) \(\sqrt{200\sqrt5}-4\).