а) \(\frac{4}{5} \cdot \frac{10}{11} = \frac{4 \cdot 10}{5 \cdot 11} = \frac{40}{55} = \frac{8}{11}\)
б) \(\frac{3}{7} : \frac{18}{19} = \frac{3}{7} \cdot \frac{19}{18} = \frac{3 \cdot 19}{7 \cdot 18} = \frac{57}{126} = \frac{19}{42}\)
в) \((\frac{3}{4})^3 = \frac{3}{4} \cdot \frac{3}{4} \cdot \frac{3}{4} = \frac{27}{64}\)