Ответ:

а) \(1\frac{1}{3}\cdot1\frac{2}{5}=\frac{4}{3}\cdot\frac{7}{5}=\frac{28}{15}=1\frac{13}{15}\).

б) \(2\frac{4}{9}\cdot3\frac{3}{11}=\frac{22}{9}\cdot\frac{36}{11}=8\).

в) \(1\frac{1}{8}\cdot1\frac{7}{9}=\frac{9}{8}\cdot\frac{16}{9}=2\).

г) \(1\frac{4}{21}\cdot4\frac{1}{4}=\frac{25}{21}\cdot\frac{17}{4}=5\frac{5}{84}\).

д) \(2\frac{2}{7}\cdot1\frac{3}{4}=\frac{16}{7}\cdot\frac{7}{4}=4\).

е) \(1\frac{1}{5}\cdot1\frac{17}{18}=\frac{6}{5}\cdot\frac{35}{18}=2\frac{1}{3}\).

Ответ: а) \(1\frac{13}{15}\); б) 8; в) 2; г) \(5\frac{5}{84}\); д) 4; е) \(2\frac{1}{3}\).