Ответ:

  1. \[0.2\sqrt{400}-\frac13\sqrt{81}=0.2\cdot20-\frac13\cdot9=4-3=1.\]
  2. \[\sqrt{49}\cdot\sqrt{0.09}+\sqrt{2^3+1}=7\cdot0.3+\sqrt9=2.1+3=5.1.\]
  3. \[5\sqrt{0.64}-\sqrt{5^2+12^2}=5\cdot0.8-\sqrt{25+144}=4-\sqrt{169}=4-13=-9.\]
  4. \[\sqrt{5\frac49}-\sqrt{1\frac{11}{25}}+0.07\sqrt{10000}=\sqrt{\frac{49}{9}}-\sqrt{\frac{36}{25}}+0.07\cdot100=\frac73-\frac65+7=\frac{106}{15}.\]

Ответ: 1) \(1\); 2) \(5{,}1\); 3) \(-9\); 4) \(\frac{106}{15}\).