Выполни действие: 9) 1 2/3 : 5/6 =

9) $1\frac{2}{3} : \frac{5}{6} = \frac{5}{3} : \frac{5}{6} = \frac{5}{3} \cdot \frac{6}{5} = \frac{30}{15} = 2$ 10) $\frac{10}{17} : 5 = \frac{10}{17} \cdot \frac{1}{5} = \frac{10}{85} = \frac{2}{17}$ 11) $11\frac{2}{3} : 3\frac{1}{9} = \frac{35}{3} : \frac{28}{9} = \frac{35}{3} \cdot \frac{9}{28} = \frac{5 \cdot 3}{4} = \frac{15}{4} = 3\frac{3}{4}$ 12) $1 : 1\frac{3}{4} = 1 : \frac{7}{4} = 1 \cdot \frac{4}{7} = \frac{4}{7}$ 13) $8 : \frac{2}{5} = 8 \cdot \frac{5}{2} = \frac{40}{2} = 20$ 14) $6\frac{4}{9} : 2 = \frac{58}{9} \cdot \frac{1}{2} = \frac{29}{9} = 3\frac{2}{9}$ 15) $\frac{5}{8} : 2\frac{1}{4} = \frac{5}{8} : \frac{9}{4} = \frac{5}{8} \cdot \frac{4}{9} = \frac{5}{18}$ 16) $\frac{4}{15} : \frac{1}{3} = \frac{4}{15} \cdot 3 = \frac{4}{5}$ 17) $12 : 1\frac{1}{3} = 12 : \frac{4}{3} = 12 \cdot \frac{3}{4} = 9$ 18) $3\frac{4}{9} : \frac{2}{27} = \frac{31}{9} \cdot \frac{27}{2} = \frac{31 \cdot 3}{2} = \frac{93}{2} = 46\frac{1}{2}$ 19) $1\frac{5}{18} : 1\frac{8}{15} = \frac{23}{18} : \frac{23}{15} = \frac{23}{18} \cdot \frac{15}{23} = \frac{15}{18} = \frac{5}{6}$ 20) $\frac{25}{28} : 2 = \frac{25}{28} \cdot \frac{1}{2} = \frac{25}{56}$