Задание 38. Найдите сумму.

Решение:

1. \(1 \frac{2}{6} + 1 \frac{2}{6} + 1 \frac{2}{6} = 3 \frac{6}{6} = 4\)
2. \(1 \frac{2}{5} + 1 \frac{4}{15} = 1 \frac{6}{15} + 1 \frac{4}{15} = 2 \frac{10}{15} = 2 \frac{2}{3}\)
3. \(1 \frac{2}{7} + 2 \frac{3}{14} = 1 \frac{4}{14} + 2 \frac{3}{14} = 3 \frac{7}{14} = 3 \frac{1}{2}\)
4. \(\frac{8}{9} + \frac{11}{18} = \frac{16}{18} + \frac{11}{18} = \frac{27}{18} = 1 \frac{9}{18} = 1 \frac{1}{2}\)
5. \(3 \frac{5}{7} + 1 \frac{2}{21} = 3 \frac{15}{21} + 1 \frac{2}{21} = 4 \frac{17}{21}\)
6. \(2 \frac{3}{5} + 2 \frac{11}{25} = 2 \frac{15}{25} + 2 \frac{11}{25} = 4 \frac{26}{25} = 5 \frac{1}{25}\)
7. \(5 \frac{4}{9} + 4 \frac{2}{3} = 5 \frac{4}{9} + 4 \frac{6}{9} = 9 \frac{10}{9} = 10 \frac{1}{9}\)
8. \(3 \frac{7}{8} + 2 \frac{3}{4} = 3 \frac{7}{8} + 2 \frac{6}{8} = 5 \frac{13}{8} = 6 \frac{5}{8}\)
9. \(6 \frac{11}{12} + 1 \frac{5}{6} = 6 \frac{11}{12} + 1 \frac{10}{12} = 7 \frac{21}{12} = 8 \frac{9}{12} = 8 \frac{3}{4}\)
10. \(9 \frac{4}{5} + 2 \frac{9}{20} = 9 \frac{16}{20} + 2 \frac{9}{20} = 11 \frac{25}{20} = 12 \frac{5}{20} = 12 \frac{1}{4}\)

Ответ: 1) 4; 2) \(2 \frac{2}{3}\); 3) \(3 \frac{1}{2}\); 4) \(1 \frac{1}{2}\); 5) \(4 \frac{17}{21}\); 6) \(5 \frac{1}{25}\); 7) \(10 \frac{1}{9}\); 8) \(6 \frac{5}{8}\); 9) \(8 \frac{3}{4}\); 10) \(12 \frac{1}{4}\)