в) $$5 \frac{7}{15} + 8 \frac{4}{15} = (5 + 8) + (\frac{7}{15} + \frac{4}{15}) = 13 + \frac{11}{15} = 13 \frac{11}{15}$$
г) $$13 \frac{5}{101} + 7 \frac{25}{101} = (13 + 7) + (\frac{5}{101} + \frac{25}{101}) = 20 + \frac{30}{101} = 20 \frac{30}{101}$$
Ответ: в) $$13 \frac{11}{15}$$; г) $$20 \frac{30}{101}$$