Выполни сложение: 1) \(1\frac{2}{7}+2\frac{3}{7}\); 2) \(3\frac{5}{9}+1\frac{4}{9}\); 3) \(2\frac{1}{5}+3\frac{2}{5}\).

1. \(1\frac{2}{7}+2\frac{3}{7}=3\frac{5}{7}\).
2. \(3\frac{5}{9}+1\frac{4}{9}=4\frac{9}{9}=5\).
3. \(2\frac{1}{5}+3\frac{2}{5}=5\frac{3}{5}\).

Ответ: 1) \(3\frac{5}{7}\); 2) \(5\); 3) \(5\frac{3}{5}\).