а) \( \frac{3}{7} \cdot \frac{5}{11} = \frac{3 \cdot 5}{7 \cdot 11} = \frac{15}{77} \)
б) \( \frac{6}{25} \cdot \frac{5}{18} = \frac{6 \cdot 5}{25 \cdot 18} = \frac{30}{450} = \frac{1}{15} \)
в) \( 3 \frac{1}{5} \cdot 1 \frac{1}{9} = \frac{16}{5} \cdot \frac{10}{9} = \frac{16 \cdot 10}{5 \cdot 9} = \frac{160}{45} = \frac{32}{9} = 3 \frac{5}{9} \)
г) \( 1 \frac{3}{7} \cdot 14 = \frac{10}{7} \cdot 14 = \frac{10 \cdot 14}{7} = 10 \cdot 2 = 20 \)
д) \( \frac{5}{9} : \frac{10}{27} = \frac{5}{9} \cdot \frac{27}{10} = \frac{5 \cdot 27}{9 \cdot 10} = \frac{1 \cdot 3}{1 \cdot 2} = \frac{3}{2} = 1 \frac{1}{2} \)
е) \( \frac{12}{13} : 6 = \frac{12}{13} \cdot \frac{1}{6} = \frac{12 \cdot 1}{13 \cdot 6} = \frac{2 \cdot 1}{13 \cdot 1} = \frac{2}{13} \)
Ответ: а) \(\frac{15}{77}\); б) \(\frac{1}{15}\); в) \(3\frac{5}{9}\); г) \(20\); д) \(1\frac{1}{2}\); е) \(\frac{2}{13}\).