Tính.

\(\frac{3}{8}\) + \(\frac{{13}}{{64}}\) = \(\frac{{24}}{{64}}\) + \(\frac{{13}}{{64}}\)= \(\frac{{37}}{{64}}\)

\(\frac{8}{9}\) – \(\frac{{33}}{{72}}\) = \(\frac{{64}}{{72}}\) – \(\frac{{33}}{{72}}\) = \(\frac{{31}}{{72}}\)

\(\frac{{35}}{{32}}\) × \(\frac{3}{7}\) = \(\frac{{15}}{{32}}\)

\(\frac{5}{{16}}\) : \(\frac{{40}}{{60}}\) = \(\frac{5}{{16}}\) × \(\frac{{60}}{{40}}\) = \(\frac{{15}}{{32}}\)