Краткое пояснение: Решаем примеры с обыкновенными и смешанными дробями, выполняя сложение, вычитание, умножение и деление.
Решение:
- 1) \( 1 + 1\frac{5}{6} = 1\frac{6}{6} + \frac{5}{6} = 2\frac{5}{6} \)
- 2) \( 7 - \frac{3}{8} = 6\frac{8}{8} - \frac{3}{8} = 6\frac{5}{8} \)
- 3) \( 4\frac{5}{6} + 2\frac{3}{8} = 4\frac{20}{24} + 2\frac{9}{24} = 6\frac{29}{24} = 7\frac{5}{24} \)
- 4) \( 7\frac{5}{18} - 1\frac{7}{12} = 7\frac{10}{36} - 1\frac{21}{36} = 6\frac{46}{36} - 1\frac{21}{36} = 5\frac{25}{36} \)
- 5) \( 20 - (3\frac{1}{6} + 2\frac{3}{4}) = 20 - (3\frac{2}{12} + 2\frac{9}{12}) = 20 - 5\frac{11}{12} = 19\frac{12}{12} - 5\frac{11}{12} = 14\frac{1}{12} \)
- 6) \( 3\frac{1}{9} \cdot 2\frac{1}{7} = \frac{28}{9} \cdot \frac{15}{7} = \frac{4}{3} \cdot \frac{5}{1} = \frac{20}{3} = 6\frac{2}{3} \)
- 7) \( \frac{4}{11} \cdot 4\frac{7}{12} = \frac{4}{11} \cdot \frac{55}{12} = \frac{1}{1} \cdot \frac{5}{3} = \frac{5}{3} = 1\frac{2}{3} \)
- 8) \( \frac{5}{9} \cdot \frac{18}{25} = \frac{1}{1} \cdot \frac{2}{5} = \frac{2}{5} \)
- 9) \( 36 \cdot \frac{5}{42} = \frac{6}{1} \cdot \frac{5}{7} = \frac{30}{7} = 4\frac{2}{7} \)
- 10) \( \frac{3}{4} : \frac{9}{14} = \frac{3}{4} \cdot \frac{14}{9} = \frac{1}{2} \cdot \frac{7}{3} = \frac{7}{6} = 1\frac{1}{6} \)
- 11) \( (2\frac{3}{4} : 5\frac{1}{2}) + 13 = (\frac{11}{4} : \frac{11}{2}) + 13 = (\frac{11}{4} \cdot \frac{2}{11}) + 13 = \frac{1}{2} + 13 = 13\frac{1}{2} \)
Ответ: 1) \(2\frac{5}{6}\); 2) \(6\frac{5}{8}\); 3) \(7\frac{5}{24}\); 4) \(5\frac{25}{36}\); 5) \(14\frac{1}{12}\); 6) \(6\frac{2}{3}\); 7) \(1\frac{2}{3}\); 8) \(\frac{2}{5}\); 9) \(4\frac{2}{7}\); 10) \(1\frac{1}{6}\); 11) \(13\frac{1}{2}\)