Ответ:

а) НОЗ(5, 7) = 35: \(\frac{3}{5}=\frac{21}{35}\), \(\frac{4}{7}=\frac{20}{35}\).

б) НОЗ(5, 18) = 90: \(\frac{2}{5}=\frac{36}{90}\), \(\frac{5}{18}=\frac{25}{90}\).

в) НОЗ(14, 35) = 70: \(\frac{5}{14}=\frac{25}{70}\), \(\frac{8}{35}=\frac{16}{70}\).

Ответ: а) 21/35 и 20/35; б) 36/90 и 25/90; в) 25/70 и 16/70.