a) $$7 + \frac{1}{2} = 7\frac{1}{2}$$
б) $$2 + \frac{4}{9} = 2\frac{4}{9}$$
в) $$\frac{1}{3} + \frac{2}{3} + \frac{5}{8} = \frac{1+2}{3} + \frac{5}{8} = \frac{3}{3} + \frac{5}{8} = 1 + \frac{5}{8} = 1\frac{5}{8}$$
Ответ:
a) $$7\frac{1}{2}$$
б) $$2\frac{4}{9}$$
в) $$1\frac{5}{8}$$