№2. Вычисли:

в) $\frac{18}{35} : \frac{9}{15} = \frac{18}{35} \cdot \frac{15}{9} = \frac{2 \cdot 3}{7 \cdot 1} = \frac{6}{7}$ г) $\frac{27}{25} : \frac{18}{45} = \frac{27}{25} \cdot \frac{45}{18} = \frac{3 \cdot 9}{5 \cdot 2} = \frac{27}{10} = 2\frac{7}{10}$ д) $\frac{12}{25} : \frac{5}{24} = \frac{12}{25} \cdot \frac{24}{5} = \frac{288}{125} = 2\frac{38}{125}$ е) $\frac{16}{45} : \frac{9}{32} = \frac{16}{45} \cdot \frac{32}{9} = \frac{512}{405} = 1\frac{107}{405}$ ж) $\frac{4}{9} : 8 = \frac{4}{9} \cdot \frac{1}{8} = \frac{1}{9 \cdot 2} = \frac{1}{18}$ з) $8 : \frac{4}{15} = 8 \cdot \frac{15}{4} = 2 \cdot 15 = 30$ и) $\frac{34}{48} : \frac{14}{16} : \frac{7}{12} = \frac{34}{48} \cdot \frac{16}{14} \cdot \frac{12}{7} = \frac{17 \cdot 1 \cdot 12}{24 \cdot 7 \cdot 7} = \frac{17}{2 \cdot 7 \cdot 7} \cdot 1 = \frac{17}{98}$ к) $\frac{35}{56} : \frac{21}{40} : \frac{7}{8} = \frac{35}{56} \cdot \frac{40}{21} \cdot \frac{8}{7} = \frac{5}{8} \cdot \frac{40}{21} \cdot \frac{8}{7} = \frac{5 \cdot 40}{21 \cdot 7} = \frac{200}{147} = 1\frac{53}{147}$ л) $(\frac{3}{7} + \frac{2}{7}) \cdot \frac{14}{15} = \frac{5}{7} \cdot \frac{14}{15} = \frac{1 \cdot 2}{1 \cdot 3} = \frac{2}{3}$ м) $(\frac{2}{9} - \frac{3}{18}) : \frac{1}{9} = (\frac{4}{18} - \frac{3}{18}) \cdot 9 = \frac{1}{18} \cdot 9 = \frac{1}{2}$ н) $(\frac{2}{16} + \frac{1}{20}) : \frac{7}{80} = (\frac{10}{80} + \frac{4}{80}) \cdot \frac{80}{7} = \frac{14}{80} \cdot \frac{80}{7} = \frac{14}{7} = 2$