3) \(\frac{5}{14}\) \(\cdot\) 28;

3) \(\frac{5}{14}\) \(\cdot\) 28 = \(\frac{5 \cdot 28}{14}\) = \(\frac{5 \cdot 2 \cdot 14}{14}\) = 5 \(\cdot\) 2 = 10.

Ответ: 10