5). 3/4 : 33/20 =

5) $\frac{3}{4} : \frac{33}{20} = \frac{3}{4} \cdot \frac{20}{33} = \frac{1}{1} \cdot \frac{5}{11} = \frac{5}{11}$ 9) $\frac{2}{3} \cdot \frac{6}{7} : \frac{4}{7} = \frac{2 \cdot 6}{3 \cdot 7} : \frac{4}{7} = \frac{12}{21} : \frac{4}{7} = \frac{4}{7} : \frac{4}{7} = 1$ 1) $2\frac{2}{15} \cdot 1\frac{1}{16} = \frac{32}{15} \cdot \frac{17}{16} = \frac{2}{15} \cdot \frac{17}{1} = \frac{34}{15} = 2\frac{4}{15}$ 5) $2\frac{1}{42} \cdot 1\frac{7}{17} \cdot \frac{7}{12} = \frac{85}{42} \cdot \frac{24}{17} \cdot \frac{7}{12} = (\frac{85}{17}) \cdot (\frac{7}{42}) \cdot (\frac{24}{12}) = 5 \cdot \frac{1}{6} \cdot 2 = \frac{10}{6} = 1\frac{4}{6} = 1\frac{2}{3}$ 9) $2\frac{2}{3} : 2\frac{2}{7} = \frac{8}{3} : \frac{16}{7} = \frac{8}{3} \cdot \frac{7}{16} = \frac{1}{3} \cdot \frac{7}{2} = \frac{7}{6} = 1\frac{1}{6}$