Выполните действия: а) 5/6 * 7/9; б) 11/28 * 7/33; в) 6 * 3/5; г) 3/8 : 9/16; д) 15/16 : 5; е) 9/14 : 3

**Ответ:** a) $\frac{5}{6} \cdot \frac{7}{9} = \frac{5 \cdot 7}{6 \cdot 9} = \frac{35}{54}$ б) $\frac{11}{28} \cdot \frac{7}{33} = \frac{\uline{11} \cdot \uline{7}}{\uuline{28} \cdot \uuline{33}} = \frac{1 \cdot 1}{4 \cdot 3} = \frac{1}{12}$ в) $6 \cdot \frac{3}{5} = \frac{6 \cdot 3}{5} = \frac{18}{5} = 3 \frac{3}{5}$ (или $3,6$) г) $\frac{3}{8} : \frac{9}{16} = \frac{3}{8} \cdot \frac{16}{9} = \frac{\uline{3} \cdot \uuline{16}}{\uuline{8} \cdot \uline{9}} = \frac{1 \cdot 2}{1 \cdot 3} = \frac{2}{3}$ д) $\frac{15}{16} : 5 = \frac{15}{16} \cdot \frac{1}{5} = \frac{\uline{15} \cdot 1}{16 \cdot \uline{5}} = \frac{3}{16}$ е) $\frac{9}{14} : 3 = \frac{9}{14} \cdot \frac{1}{3} = \frac{\uline{9} \cdot 1}{14 \cdot \uline{3}} = \frac{3}{14}$