Ответ:

  1. \(\frac{3.6}{5.9-1.1}=\frac{3.6}{4.8}=0.75\).
  2. \(\frac{1.3+9.2}{1.5}=\frac{10.5}{1.5}=7\).
  3. \(\frac{28}{17.5-0.5}=\frac{28}{17}=\frac{28}{17}\).
  4. \(\frac{5.6\cdot0.7}{0.8}=4.9\).

Ответ: 1) 0,75; 2) 7; 3) \(\frac{28}{17}\); 4) 4,9.