Ответ:

  1. \(\sqrt{121}-\sqrt4=11-2=9\).
  2. \(\sqrt{0.25}+\sqrt{0.64}=0.5+0.8=1.3\).
  3. \(\sqrt{400}\cdot\sqrt{1.44}+8=20\cdot1.2+8=24+8=32\).
  4. \(\sqrt9-\sqrt{0.36}=3-0.6=2.4\).

Ответ: \(9;\ 1.3;\ 32;\ 2.4\).