a) \[\frac{11}{28} \cdot \frac{7}{33} = \frac{11 \cdot 7}{28 \cdot 33} = \frac{11 \cdot 7}{4 \cdot 7 \cdot 3 \cdot 11} = \frac{1}{4 \cdot 3} = \frac{1}{12}\]
в) \[6 \cdot \frac{3}{5} = \frac{6}{1} \cdot \frac{3}{5} = \frac{6 \cdot 3}{1 \cdot 5} = \frac{18}{5} = 3\frac{3}{5}\]
г) \[\frac{3}{8} : \frac{9}{16} = \frac{3}{8} \cdot \frac{16}{9} = \frac{3 \cdot 16}{8 \cdot 9} = \frac{3 \cdot 2 \cdot 8}{8 \cdot 3 \cdot 3} = \frac{2}{3}\]
д) \[\frac{15}{16} : 5 = \frac{15}{16} : \frac{5}{1} = \frac{15}{16} \cdot \frac{1}{5} = \frac{15 \cdot 1}{16 \cdot 5} = \frac{3 \cdot 5 \cdot 1}{16 \cdot 5} = \frac{3}{16}\]
е) \[\frac{9}{14} : 3 = \frac{9}{14} : \frac{3}{1} = \frac{9}{14} \cdot \frac{1}{3} = \frac{9 \cdot 1}{14 \cdot 3} = \frac{3 \cdot 3 \cdot 1}{14 \cdot 3} = \frac{3}{14}\]
Ответ: а) \(\frac{1}{12}\); в) \(3\frac{3}{5}\); г) \(\frac{2}{3}\); д) \(\frac{3}{16}\); е) \(\frac{3}{14}\)