Ответ:

  1. \(1.95+\frac{3}{5}=1.95+0.6=2.55\).
  2. \(2\frac{1}{25}-0.45=2.04-0.45=1.59\).
  3. \(\frac{1}{3}+0.6=\frac{1}{3}+\frac{3}{5}=\frac{5}{15}+\frac{9}{15}=\frac{14}{15}\).
  4. \(0.8-\frac{4}{15}=\frac{4}{5}-\frac{4}{15}=\frac{12}{15}-\frac{4}{15}=\frac{8}{15}\).