Ответ:

\(\frac{5}{9}=\frac{5\cdot4}{9\cdot4}=\frac{20}{36}\).

\(\frac{56}{105}=\frac{56:7}{105:7}=\frac{8}{15}\).

Ответ: \(\frac{20}{36}\) и \(\frac{8}{15}\).