Ответ:

а) \(\frac{3}{8}\cdot\frac{9}{11}=\frac{27}{88}\).

б) \(\frac{22}{35}\cdot\frac{21}{44}=\frac{1}{2}\cdot\frac{3}{5}=\frac{3}{10}\).

д) \(5\frac{3}{5}\cdot1\frac{4}{21}=\frac{28}{5}\cdot\frac{25}{21}=\frac{20}{3}=6\frac{2}{3}\).

е) \(9\frac{3}{7}\cdot1\frac{3}{11}=\frac{66}{7}\cdot\frac{14}{11}=12\).

к) \(1\frac{1}{15}\cdot\frac{5}{16}=\frac{16}{15}\cdot\frac{5}{16}=\frac{1}{3}\).

л) \(\frac{7}{11}\cdot2\frac{5}{14}=\frac{7}{11}\cdot\frac{33}{14}=\frac{3}{2}=1\frac{1}{2}\).

Ответ: а) \(\frac{27}{88}\); б) \(\frac{3}{10}\); д) \(6\frac{2}{3}\); е) \(12\); к) \(\frac{1}{3}\); л) \(1\frac{1}{2}\).