Выполните действие: 5 7 a) 6.9 11 7 6) 28.33 5 1 B) 3.13 7 2 г) 2.6; 3 3 9 д) 8:16 15 e) 16:5.

a) \(\frac{5}{6} \cdot \frac{7}{9} = \frac{5 \cdot 7}{6 \cdot 9} = \frac{35}{54}\) б) \(\frac{11}{28} \cdot \frac{7}{33} = \frac{11 \cdot 7}{28 \cdot 33} = \frac{1 \cdot 1}{4 \cdot 3} = \frac{1}{12}\) в) \(3\frac{5}{7} \cdot 1\frac{1}{13} = \frac{26}{7} \cdot \frac{14}{13} = \frac{2 \cdot 2}{1 \cdot 1} = 4\) г) \(2\frac{2}{3} \cdot 6 = \frac{8}{3} \cdot 6 = \frac{8 \cdot 2}{1} = 16\) д) \(\frac{3}{8} : \frac{9}{16} = \frac{3}{8} \cdot \frac{16}{9} = \frac{1}{1} \cdot \frac{2}{3} = \frac{2}{3}\) е) \(\frac{15}{16} : 5 = \frac{15}{16} \cdot \frac{1}{5} = \frac{3}{16} \cdot \frac{1}{1} = \frac{3}{16}\)