3) Сократи дроби: 36/84; 65/110; (28·7)/(35·14).

1. \(\frac{36}{84}=\frac{36:12}{84:12}=\frac{3}{7}\).
2. \(\frac{65}{110}=\frac{65:5}{110:5}=\frac{13}{22}\).
3. \(\frac{28\cdot7}{35\cdot14}=\frac{196}{490}=\frac{196:98}{490:98}=\frac{2}{5}\).

Ответ: \(\frac{3}{7};\ \frac{13}{22};\ \frac{2}{5}\).