Tính a) \(\frac{3}{{16}} + \frac{{14}}{{32}} =

a) \(\frac{3}{{16}} + \frac{{14}}{{32}} = \frac{3}{{16}} + \frac{7}{{16}} = \frac{{10}}{{16}} = \frac{5}{8}\)

b) \(\frac{{13}}{8} \times \frac{4}{{20}} = \frac{{13}}{8} \times \frac{1}{5} = \frac{{13}}{{40}}\)

c) \(\frac{9}{{21}} - \frac{2}{7} = \)\(\frac{3}{7} - \frac{2}{7} = \frac{1}{7}\)

d) \(\frac{8}{{21}}:\frac{2}{3} = \)\(\frac{8}{{21}} \times \frac{3}{2} = \frac{{24}}{{42}} = \frac{{12}}{{21}}\)