12-11 9) 5-14

9) $$\frac{12 \cdot 11}{5 \cdot 14} = \frac{12 \cdot 11}{5 \cdot 14} = \frac{6 \cdot 11}{5 \cdot 7} = \frac{66}{35}$$

Ответ: $$\frac{66}{35}$$