а) \(\frac{2}{3} \cdot \frac{8}{13} = \frac{2 \cdot 8}{3 \cdot 13} = \frac{16}{39}\)
б) \(\frac{12}{49} \cdot \frac{7}{24} = \frac{12 \cdot 7}{49 \cdot 24} = \frac{12 \cdot 7}{7 \cdot 7 \cdot 12 \cdot 2} = \frac{1}{7 \cdot 2} = \frac{1}{14}\)
г) \(2 \frac{5}{11} \cdot 2 \frac{4}{5} = \frac{2 \cdot 11 + 5}{11} \cdot \frac{2 \cdot 5 + 4}{5} = \frac{27}{11} \cdot \frac{14}{5} = \frac{27 \cdot 14}{11 \cdot 5} = \frac{378}{55} = 6 \frac{48}{55}\)