2 H) 3,8:c=2:2- 19

H) Решим пропорцию:

$$3.8 : c = 2 : 2\frac{2}{19}$$

$$3.8 : c = 2 : \frac{40}{19}$$

$$c = \frac{3.8 \cdot \frac{40}{19}}{2} = \frac{3.8 \cdot 40}{19 \cdot 2} = \frac{152}{38} = 4$$

Ответ: $$c = 4$$