1. Вычислите: a) \(\frac{4}{5} \cdot \frac{10}{11}\) b) \(\frac{3}{7} \cdot \frac{18}{19}\) c) \((\frac{3}{4})^2\)

a) \(\frac{4}{5} \cdot \frac{10}{11} = \frac{4 \cdot 10}{5 \cdot 11} = \frac{40}{55} = \frac{8}{11}\) b) \(\frac{3}{7} \cdot \frac{18}{19} = \frac{3 \cdot 18}{7 \cdot 19} = \frac{54}{133}\) c) \((\frac{3}{4})^2 = \frac{3}{4} \cdot \frac{3}{4} = \frac{3 \cdot 3}{4 \cdot 4} = \frac{9}{16}\)