Ответ:

  1. \(\frac12\sqrt{24}=\frac12\cdot2\sqrt6=\sqrt6\);
  2. \(\frac23\sqrt{45}=\frac23\cdot3\sqrt5=2\sqrt5\);
  3. \(-\frac17\sqrt{147}=-\frac17\cdot7\sqrt3=-\sqrt3\);
  4. \(-\frac15\sqrt{275}=-\frac15\cdot5\sqrt{11}=-\sqrt{11}\);
  5. \(0,1\sqrt{20000}=0,1\cdot100\sqrt2=10\sqrt2\);
  6. \(-0,05\sqrt{28800}=-0,05\cdot120\sqrt2=-6\sqrt2\).

Ответ: а) \(\sqrt6\); б) \(2\sqrt5\); в) \(-\sqrt3\); г) \(-\sqrt{11}\); д) \(10\sqrt2\); е) \(-6\sqrt2\).