2. Выполните действия: 1) \(\frac{19}{28} + \frac{16}{28} - \frac{17}{28}\) 2) \(4\frac{11}{14} - 2\frac{5}{14} + 1\frac{3}{14}\) 3) \(1 - \frac{8}{17}\) 4) \(4\frac{5}{9} - 2\frac{8}{9}\)

Решение:

1. \(\frac{19}{28} + \frac{16}{28} - \frac{17}{28} = \frac{19+16-17}{28} = \frac{18}{28} = \frac{9}{14}\)
2. \(4\frac{11}{14} - 2\frac{5}{14} + 1\frac{3}{14} = (4 - 2 + 1) + (\frac{11}{14} - \frac{5}{14} + \frac{3}{14}) = 3 + \frac{11-5+3}{14} = 3 + \frac{9}{14} = 3\frac{9}{14}\)
3. \(1 - \frac{8}{17} = \frac{17}{17} - \frac{8}{17} = \frac{17-8}{17} = \frac{9}{17}\)
4. \(4\frac{5}{9} - 2\frac{8}{9} = 3\frac{14}{9} - 2\frac{8}{9} = (3-2) + (\frac{14}{9} - \frac{8}{9}) = 1 + \frac{6}{9} = 1\frac{6}{9} = 1\frac{2}{3}\)

Ответ: 1) \(\frac{9}{14}\); 2) \(3\frac{9}{14}\); 3) \(\frac{9}{17}\); 4) \(1\frac{2}{3}\).