Ответ:

  1. НОЗ = 18: \(\frac{1}{9}=\frac{2}{18}\), \(\frac{1}{6}=\frac{3}{18}\).
  2. НОЗ = 24: \(\frac{7}{12}=\frac{14}{24}\), \(\frac{5}{8}=\frac{15}{24}\).
  3. НОЗ = 90: \(\frac{4}{30}=\frac{12}{90}\), \(\frac{7}{18}=\frac{35}{90}\).
  4. Знаменатели уже одинаковые: \(\frac{8}{9}\) и \(\frac{5}{9}\).
  5. НОЗ = 60: \(\frac{14}{15}=\frac{56}{60}\), \(\frac{11}{12}=\frac{55}{60}\).
  6. НОЗ = 28: \(\frac{3}{4}=\frac{21}{28}\), \(\frac{5}{14}=\frac{10}{28}\), \(\frac{4}{7}=\frac{16}{28}\).

Ответ: 1) \(\frac{2}{18}\) и \(\frac{3}{18}\); 2) \(\frac{14}{24}\) и \(\frac{15}{24}\); 3) \(\frac{12}{90}\) и \(\frac{35}{90}\); 4) \(\frac{8}{9}\) и \(\frac{5}{9}\); 5) \(\frac{56}{60}\) и \(\frac{55}{60}\); 6) \(\frac{21}{28}\), \(\frac{10}{28}\) и \(\frac{16}{28}\).