Ответ:

  1. \(0.8\cdot\frac{7}{12}=\frac{4}{5}\cdot\frac{7}{12}=\frac{7}{15}\).
  2. \(1\frac{2}{3}\cdot0.6=\frac{5}{3}\cdot\frac{3}{5}=1\).
  3. \(1.25\cdot\frac{32}{45}=\frac{5}{4}\cdot\frac{32}{45}=\frac{8}{9}\).
  4. \(4.5\cdot3\frac{1}{3}=\frac{9}{2}\cdot\frac{10}{3}=15\).

Ответ: 1) \(\frac{7}{15}\); 2) \(1\); 3) \(\frac{8}{9}\); 4) \(15\).