Rút gọn các phân số sau: 9/15

\(\frac{9}{{15}}\) = \(\frac{{9:3}}{{15:3}} = \frac{3}{5}\)

\(\frac{{36}}{{28}}\) = \(\frac{{36:4}}{{28:4}} = \frac{9}{7}\)

\(\frac{{78}}{{42}}\) = \(\frac{{78:6}}{{42:6}} = \frac{{13}}{7}\)

\(\frac{{35}}{{56}}\) = \(\frac{{35:7}}{{56:7}} = \frac{5}{8}\)