2. Выполните действия: 1) \(\frac{7}{27}+\frac{16}{27}-\frac{19}{27}\); 2) \(4\frac{5}{19}-2\frac{2}{19}+7\frac{9}{19}\); 3) \(1-\frac{18}{27}\); 4) \(6\frac{2}{9}-4\frac{5}{9}\).

1. \(\frac{7}{27}+\frac{16}{27}-\frac{19}{27}=\frac{7+16-19}{27}=\frac{4}{27}\).
2. \(4\frac{5}{19}-2\frac{2}{19}+7\frac{9}{19}=9\frac{5-2+9}{19}=9\frac{12}{19}\).
3. \(1-\frac{18}{27}=1-\frac{2}{3}=\frac{1}{3}\).
4. \(6\frac{2}{9}-4\frac{5}{9}=\frac{56}{9}-\frac{41}{9}=\frac{15}{9}=1\frac{2}{3}\).

Ответ: 1) \(\frac{4}{27}\); 2) \(9\frac{12}{19}\); 3) \(\frac{1}{3}\); 4) \(1\frac{2}{3}\).