a) \(\frac{4}{33} : \frac{11}{19} = \frac{4}{33} \cdot \frac{19}{11} = \frac{4 \cdot 19}{33 \cdot 11} = \frac{76}{363}\)
б) \(\frac{3}{22} \cdot \frac{22}{3} = \frac{3 \cdot 22}{22 \cdot 3} = 1\)
в) \(\frac{4}{9} \cdot 2\frac{1}{4} = \frac{4}{9} \cdot \frac{9}{4} = \frac{4 \cdot 9}{9 \cdot 4} = 1\)
г) \(1\frac{1}{5} \cdot 2\frac{5}{6} = \frac{6}{5} \cdot \frac{17}{6} = \frac{6 \cdot 17}{5 \cdot 6} = \frac{17}{5} = 3\frac{2}{5}\)
\textbf{Ответ:} а) \(\frac{76}{363}\); б) 1; в) 1; г) \(3\frac{2}{5}\)