Ответ:

  1. \(3.6\cdot\frac{2}{9}=\frac{36}{10}\cdot\frac{2}{9}=0.8\).

  2. \(7\frac{1}{5}-3.059=7.2-3.059=4.141\).

  3. \(\frac{1}{8}:12.5=0.125:12.5=0.01\).

  4. \(2\frac{3}{11}\cdot0.22=\frac{25}{11}\cdot\frac{11}{50}=0.5\).

Ответ: 1) 0,8; 2) 4,141; 3) 0,01; 4) 0,5.