Выполните действия: а) \(\frac{17}{33}-\frac{5}{22}\); б) \(\frac{27}{76}-0\); в) \(\frac{9}{20}+\frac{5}{8}\); г) \(\frac{2}{7}+\frac{13}{28}\).

1. \(\frac{17}{33}-\frac{5}{22}=\frac{34}{66}-\frac{15}{66}=\frac{19}{66}\).
2. \(\frac{27}{76}-0=\frac{27}{76}\).
3. \(\frac{9}{20}+\frac{5}{8}=\frac{18}{40}+\frac{25}{40}=\frac{43}{40}=1\frac{3}{40}\).
4. \(\frac{2}{7}+\frac{13}{28}=\frac{8}{28}+\frac{13}{28}=\frac{21}{28}=\frac{3}{4}\).

Ответ: а) \(\frac{19}{66}\); б) \(\frac{27}{76}\); в) \(1\frac{3}{40}\); г) \(\frac{3}{4}\).