Tính: 2/3 + 4/9

a) \(\frac{2}{3} + \frac{4}{9} = \frac{6}{9} + \frac{4}{9} = \frac{{10}}{9}\)

b) \(\frac{4}{5} \times \frac{3}{8} = \frac{1}{5} \times \frac{3}{2} = \frac{3}{{10}}\)

c) \(\frac{2}{3} - \frac{1}{{12}} = \frac{8}{{12}} - \frac{1}{{12}} = \frac{7}{{12}}\)

d) \(\frac{1}{2}:\frac{2}{5} = \frac{1}{2} \times \frac{5}{2} = \frac{5}{4}\)