31. Сократите дроби.

Решение:

a) \(\frac{3}{15} = \frac{3}{5 \cdot 3} = \frac{1}{5}\)

б) \(\frac{7}{21} = \frac{7}{3 \cdot 7} = \frac{1}{3}\)

в) \(\frac{8}{36} = \frac{2 \cdot 4}{9 \cdot 4} = \frac{2}{9}\)

г) \(\frac{16}{18} = \frac{8 \cdot 2}{9 \cdot 2} = \frac{8}{9}\)

д) \(\frac{30}{60} = \frac{30}{2 \cdot 30} = \frac{1}{2}\)

е) \(\frac{10}{26} = \frac{5 \cdot 2}{13 \cdot 2} = \frac{5}{13}\)