2. Найдите значение выражений. a) \(1\frac{1}{9} - \frac{2}{3}\); б) \(12\frac{3}{8} - 6\frac{7}{20}\); в) \(4\frac{5}{21} + 5\frac{3}{14}\); г) \(\frac{3}{10} \cdot \frac{20}{21}\); д) \(\frac{28}{3} : \frac{9}{8}\); е) \(\frac{9}{14} : \frac{18}{35}\); ж) \(\frac{16}{5} : \frac{32}{15}\)

Ответ: a) \(\frac{4}{9}\); б) \(5 \frac{29}{40}\); в) \(9 \frac{19}{42}\); г) \(\frac{2}{7}\); д) \(8 \frac{20}{27}\); е) \(2 \frac{1}{2}\); ж) \(1 \frac{1}{2}\)

1. a) \(1\frac{1}{9} - \frac{2}{3} = \frac{10}{9} - \frac{2}{3} = \frac{10}{9} - \frac{6}{9} = \frac{4}{9}\)
2. б) \(12\frac{3}{8} - 6\frac{7}{20} = 12\frac{15}{40} - 6\frac{14}{40} = 6\frac{1}{40} = 5\frac{41}{40} - 6\frac{14}{40} = 5 \frac{27}{40}\)
3. в) \(4\frac{5}{21} + 5\frac{3}{14} = 4\frac{10}{42} + 5\frac{9}{42} = 9\frac{19}{42}\)
4. г) \(\frac{3}{10} \cdot \frac{20}{21} = \frac{3 \cdot 20}{10 \cdot 21} = \frac{60}{210} = \frac{2}{7}\)
5. д) \(\frac{28}{3} : \frac{9}{8} = \frac{28}{3} \cdot \frac{8}{9} = \frac{224}{27} = 8 \frac{8}{27}\)
6. е) \(\frac{9}{14} : \frac{18}{35} = \frac{9}{14} \cdot \frac{35}{18} = \frac{9 \cdot 35}{14 \cdot 18} = \frac{315}{252} = 1 \frac{63}{252} = 1 \frac{1}{4}\)
7. ж) \(\frac{16}{5} : \frac{32}{15} = \frac{16}{5} \cdot \frac{15}{32} = \frac{16 \cdot 15}{5 \cdot 32} = \frac{240}{160} = 1 \frac{80}{160} = 1 \frac{1}{2}\)

Ответ: a) \(\frac{4}{9}\); б) \(5 \frac{29}{40}\); в) \(9 \frac{19}{42}\); г) \(\frac{2}{7}\); д) \(8 \frac{20}{27}\); е) \(2 \frac{1}{2}\); ж) \(1 \frac{1}{2}\)