Ответ:

  1. \(\frac{8}{15}-\frac{1}{3}=\frac{8}{15}-\frac{5}{15}=\frac{3}{15}=\frac{1}{5}\).
  2. \(\frac{17}{19}\cdot 7.6=\frac{17}{19}\cdot\frac{38}{5}=\frac{34}{5}=6.8\).
  3. \(\frac{33}{5}:\frac{11}{27}=\frac{33}{5}\cdot\frac{27}{11}=\frac{81}{5}=16.2\).
  4. \(2.5\cdot3.6=9\).
  5. \(7.9-8.5=-0.6\).
  6. \(\frac{5.7}{9.5}=\frac{57}{95}=\frac{3}{5}=0.6\).

Ответ: а) \(\frac{1}{5}\); б) \(6.8\); в) \(16.2\); г) \(9\); д) \(-0.6\); е) \(0.6\).