Решение:
- \( \frac{1}{5} \cdot 10 = \frac{1 \cdot 10}{5} = \frac{10}{5} = 2 \)
- \( \frac{2}{6} \cdot 9 = \frac{2 \cdot 9}{6} = \frac{18}{6} = 3 \)
- \( \frac{2}{13} \cdot 14 = \frac{2 \cdot 14}{13} = \frac{28}{13} \)
- \( \frac{3}{7} \cdot 4 = \frac{3 \cdot 4}{7} = \frac{12}{7} \)
- \( \frac{12}{21} \cdot 4 = \frac{12 \cdot 4}{21} = \frac{48}{21} = \frac{16}{7} \)
- \( 6 \cdot \frac{3}{4} = \frac{6 \cdot 3}{4} = \frac{18}{4} = \frac{9}{2} \)
- \( 7 \cdot \frac{1}{22} = \frac{7 \cdot 1}{22} = \frac{7}{22} \)
Ответ: 2; 3; 28/13; 12/7; 16/7; 9/2; 7/22.