a) \(7 \frac{8}{9} - 3 \frac{5}{9}\)
- \(7 \frac{8}{9} - 3 \frac{5}{9} = (7-3) + (\frac{8}{9} - \frac{5}{9}) = 4 + \frac{3}{9} = 4 \frac{3}{9}\)
- Сокращаем дробную часть на 3: \(4 \frac{3}{9} = 4 \frac{1}{3}\)
Ответ: \(4 \frac{1}{3}\)
б) \(5 \frac{5}{12} + 2 \frac{1}{12}\)
- \(5 \frac{5}{12} + 2 \frac{1}{12} = (5+2) + (\frac{5}{12} + \frac{1}{12}) = 7 + \frac{6}{12} = 7 \frac{6}{12}\)
- Сокращаем дробную часть на 6: \(7 \frac{6}{12} = 7 \frac{1}{2}\)
Ответ: \(7 \frac{1}{2}\)
в) \(29 \frac{11}{21} - 29 \frac{5}{21}\)
- \(29 \frac{11}{21} - 29 \frac{5}{21} = (29-29) + (\frac{11}{21} - \frac{5}{21}) = 0 + \frac{6}{21} = \frac{6}{21}\)
- Сокращаем дробь на 3: \(\frac{6}{21} = \frac{2}{7}\)
Ответ: \(\frac{2}{7}\)
г) \(6 \frac{3}{10} + 7 \frac{5}{10}\)
- \(6 \frac{3}{10} + 7 \frac{5}{10} = (6+7) + (\frac{3}{10} + \frac{5}{10}) = 13 + \frac{8}{10} = 13 \frac{8}{10}\)
- Сокращаем дробную часть на 2: \(13 \frac{8}{10} = 13 \frac{4}{5}\)
Ответ: \(13 \frac{4}{5}\)