2. 2 б) 7:9 4 16 д) 7: 49 12 8 ж) 25:15 5. 7 г) 8:12 5 1 e) 9: 2 9 18 з) 14:35

Ответ: смотри решение

Разбираемся:

1. б) \(\frac{2}{7}:\frac{2}{9} = \frac{2}{7} \cdot \frac{9}{2} = \frac{2 \cdot 9}{7 \cdot 2} = \frac{9}{7} = 1\frac{2}{7}\)
2. д) \(\frac{4}{7}:\frac{16}{49} = \frac{4}{7} \cdot \frac{49}{16} = \frac{4 \cdot 49}{7 \cdot 16} = \frac{1 \cdot 7}{1 \cdot 4} = \frac{7}{4} = 1\frac{3}{4}\)
3. ж) \(\frac{12}{25}:\frac{8}{15} = \frac{12}{25} \cdot \frac{15}{8} = \frac{12 \cdot 15}{25 \cdot 8} = \frac{3 \cdot 3}{5 \cdot 2} = \frac{9}{10}\)
4. г) \(\frac{5}{8}:\frac{7}{12} = \frac{5}{8} \cdot \frac{12}{7} = \frac{5 \cdot 12}{8 \cdot 7} = \frac{5 \cdot 3}{2 \cdot 7} = \frac{15}{14} = 1\frac{1}{14}\)
5. е) \(\frac{5}{9}:\frac{1}{2} = \frac{5}{9} \cdot \frac{2}{1} = \frac{5 \cdot 2}{9 \cdot 1} = \frac{10}{9} = 1\frac{1}{9}\)
6. з) \(\frac{9}{14}:\frac{18}{35} = \frac{9}{14} \cdot \frac{35}{18} = \frac{9 \cdot 35}{14 \cdot 18} = \frac{1 \cdot 5}{2 \cdot 2} = \frac{5}{4} = 1\frac{1}{4}\)

Ответ: смотри решение