2-9 19) 45-14

19) $$\frac{2 \cdot 9}{45 \cdot 14} = \frac{2 \cdot 9}{45 \cdot 14} = \frac{2 \cdot 1}{5 \cdot 14} = \frac{1 \cdot 1}{5 \cdot 7} = \frac{1}{35}$$

Ответ: $$\frac{1}{35}$$