г) 2\(\frac{4}{5}\) : 1\(\frac{2}{5}\) 5\(\frac{1}{2}\) - 4\(\frac{2}{7}\) \(\frac{7}{15}\);

Решение:

1. \(2\frac{4}{5} = \frac{14}{5}\)
2. \(1\frac{2}{5} = \frac{7}{5}\)
3. \(5\frac{1}{2} = \frac{11}{2}\)
4. \(4\frac{2}{7} = \frac{30}{7}\)
5. \(\frac{14}{5} : \frac{7}{5} = \frac{14}{5} \frac{5}{7} = \frac{14}{7} = 2\)
6. \(2 \frac{11}{2} = 11\)
7. \(\frac{30}{7} \frac{7}{15} = \frac{30}{15} = 2\)
8. \(11 - 2 = 9\)

Ответ: 9