2. Выполните действия: 1) 19/28 + 16/28 − 17/28; 2) 4 11/14 − 2 5/14 + 3/14; 3) 1 − 8/17; 4) 4 5/9 − 2 8/9.

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

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