1. Вычислите: а) \(\frac{4}{33}\cdot\frac{11}{19}\); б) \(\frac{3}{22}\cdot\frac{22}{3}\); в) \(\frac{4}{9}\cdot2\frac{1}{4}\); г) \(1\frac{1}{5}\cdot2\frac{5}{8}\).

1. а) \(\frac{4}{33}\cdot\frac{11}{19}=\frac{4}{3\cdot19}=\frac{4}{57}\).
2. б) \(\frac{3}{22}\cdot\frac{22}{3}=1\).
3. в) \(\frac{4}{9}\cdot2\frac{1}{4}=\frac{4}{9}\cdot\frac{9}{4}=1\).
4. г) \(1\frac{1}{5}\cdot2\frac{5}{8}=\frac{6}{5}\cdot\frac{21}{8}=\frac{63}{20}=3\frac{3}{20}\).

Ответ: а) \(\frac{4}{57}\); б) \(1\); в) \(1\); г) \(3\frac{3}{20}\).