2. Выполните действия: 1) \(\frac{19}{28} + \frac{16}{28} - \frac{18}{28}\) 2) \(14 \frac{11}{14} - 2 \frac{5}{14} + 1 \frac{3}{14}\) 3) \(1 - \frac{8}{17}\) 4) \(\frac{3}{4} + \frac{3}{7}\)

Решение:

1. 1) \(\frac{19}{28} + \frac{16}{28} - \frac{18}{28} = \frac{19+16-18}{28} = \frac{17}{28}\)
2. 2) \(14 \frac{11}{14} - 2 \frac{5}{14} + 1 \frac{3}{14} = (14 - 2 + 1) + (\frac{11}{14} - \frac{5}{14} + \frac{3}{14}) = 13 + \frac{11-5+3}{14} = 13 + \frac{9}{14} = 13 \frac{9}{14}\)
3. 3) \(1 - \frac{8}{17} = \frac{17}{17} - \frac{8}{17} = \frac{17-8}{17} = \frac{9}{17}\)
4. 4) \(\frac{3}{4} + \frac{3}{7} = \frac{3 \times 7}{4 \times 7} + \frac{3 \times 4}{7 \times 4} = \frac{21}{28} + \frac{12}{28} = \frac{21+12}{28} = \frac{33}{28} = 1 \frac{5}{28}\)

Ответ: 1) \(\frac{17}{28}\); 2) \(13 \frac{9}{14}\); 3) \(\frac{9}{17}\); 4) \(1 \frac{5}{28}\).