а) $7 + 2\frac{5}{8} = 7 + 2 + \frac{5}{8} = 9\frac{5}{8}$
б) $9\frac{1}{9} + 20 = 9 + \frac{1}{9} + 20 = 29\frac{1}{9}$
в) $64\frac{1}{7} + 4\frac{4}{7} = 64 + 4 + \frac{1}{7} + \frac{4}{7} = 68 + \frac{5}{7} = 68\frac{5}{7}$
г) $7\frac{5}{7} + 4\frac{1}{7} = 7 + 4 + \frac{5}{7} + \frac{1}{7} = 11 + \frac{6}{7} = 11\frac{6}{7}$
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