Ответ:

а) \(8\cdot\frac{5}{11}=\frac{40}{11}=3\frac{7}{11}\).

б) \(\frac{6}{25}\cdot\frac{5}{18}=\frac{30}{450}=\frac{1}{15}\).

в) \(3\frac{3}{5}\cdot1\frac{1}{9}=\frac{18}{5}\cdot\frac{10}{9}=4\).

г) \(\frac{5}{9}:\frac{10}{27}=\frac{5}{9}\cdot\frac{27}{10}=\frac{3}{2}=1\frac{1}{2}\).

д) \(\frac{12}{13}:6=\frac{12}{13}\cdot\frac{1}{6}=\frac{2}{13}\).

е) \(3\frac{17}{20}:4\frac{2}{5}=\frac{77}{20}:\frac{22}{5}=\frac{77}{20}\cdot\frac{5}{22}=\frac{7}{8}\).

Ответ: а) \(3\frac{7}{11}\); б) \(\frac{1}{15}\); в) 4; г) \(1\frac{1}{2}\); д) \(\frac{2}{13}\); е) \(\frac{7}{8}\).