а) \(\frac{2}{13} = \frac{2 \times 5}{13 \times 5} = \frac{10}{65}\)
б) \(\frac{8}{9} = \frac{8 \times 12}{9 \times 12} = \frac{96}{108}\)
в) \(\frac{5}{14} = \frac{5 \times 12}{14 \times 12} = \frac{60}{168}\)
г) \(\frac{13}{18} = \frac{13 \times 9}{18 \times 9} = \frac{117}{162}\)