4). \(\left(1\frac{1}{35} : \frac{4}{5} - 1\frac{8}{35}\right) \cdot 3\frac{1}{3}\)

Решение:

1. \(1\frac{1}{35} = \frac{36}{35}\)
2. \(1\frac{8}{35} = \frac{43}{35}\)
3. \(3\frac{1}{3} = \frac{10}{3}\)
4. \(\frac{36}{35} : \frac{4}{5} = \frac{36}{35} \cdot \frac{5}{4} = \frac{9 \cdot 4}{7 \cdot 5} \cdot \frac{5}{4} = \frac{9}{7}\)
5. \(\frac{9}{7} - \frac{43}{35} = \frac{9 \cdot 5 - 43}{35} = \frac{45 - 43}{35} = \frac{2}{35}\)
6. \(\frac{2}{35} \cdot \frac{10}{3} = \frac{2 \cdot 10}{35 \cdot 3} = \frac{20}{105} = \frac{4}{21}\)

Ответ: \(\frac{4}{21}\)