Ответ:

а) НОЗ(30, 24) = 120:

\(\frac{11}{30}=\frac{44}{120}\), \(\frac{11}{24}=\frac{55}{120}\).

б) НОЗ(750, 450) = 2250:

\(\frac{13}{750}=\frac{39}{2250}\), \(\frac{7}{450}=\frac{35}{2250}\).

Ответ: а) \(\frac{44}{120}\) и \(\frac{55}{120}\); б) \(\frac{39}{2250}\) и \(\frac{35}{2250}\).