Điền vào chỗ chấm. 1/2 + 1/4

a) \[\frac{1}{2} + \frac{1}{4} = \frac{2}{4} + \frac{1}{4} = \frac{3}{4}\]

b) \[\frac{7}{8} + \frac{1}{2} = \frac{7}{8} + \frac{4}{8} = \frac{{11}}{8}\]

c) \[\frac{1}{3} + \frac{4}{{15}} = \frac{5}{{15}} + \frac{4}{{15}} = \frac{9}{{15}}\]

d) \[\frac{5}{8} + \frac{5}{{24}} = \frac{{15}}{{24}} + \frac{5}{{24}} = \frac{{20}}{{24}}\]