Выполните деление: а) 6/25 : 9/5

Выполним деление: а) $$\frac{6}{25} : \frac{9}{5} = \frac{6}{25} \cdot \frac{5}{9} = \frac{6 \cdot 5}{25 \cdot 9} = \frac{2 \cdot 3 \cdot 5}{5 \cdot 5 \cdot 3 \cdot 3} = \frac{2}{15}$$ б) $$6 \frac{2}{3} : 1 \frac{1}{8} = \frac{20}{3} : \frac{9}{8} = \frac{20}{3} \cdot \frac{8}{9} = \frac{20 \cdot 8}{3 \cdot 9} = \frac{160}{27} = 5 \frac{25}{27}$$ в) $$\frac{3}{8} : \frac{2}{3} = \frac{3}{8} \cdot \frac{3}{2} = \frac{3 \cdot 3}{8 \cdot 2} = \frac{9}{16}$$ г) $$4 \frac{1}{11} : 2 \frac{19}{22} = \frac{45}{11} : \frac{63}{22} = \frac{45}{11} \cdot \frac{22}{63} = \frac{45 \cdot 22}{11 \cdot 63} = \frac{45 \cdot 2}{63} = \frac{5 \cdot 9 \cdot 2}{7 \cdot 9} = \frac{10}{7} = 1 \frac{3}{7}$$ д) $$\frac{8}{27} : \frac{8}{9} = \frac{8}{27} \cdot \frac{9}{8} = \frac{8 \cdot 9}{27 \cdot 8} = \frac{9}{27} = \frac{1}{3}$$ е) $$57 : \frac{19}{24} = 57 \cdot \frac{24}{19} = \frac{57 \cdot 24}{19} = 3 \cdot 24 = 72$$ ж) $$\frac{14}{39} : \frac{21}{52} = \frac{14}{39} \cdot \frac{52}{21} = \frac{2 \cdot 7 \cdot 4 \cdot 13}{3 \cdot 13 \cdot 3 \cdot 7} = \frac{2 \cdot 4}{3 \cdot 3} = \frac{8}{9}$$ з) $$11 \frac{2}{5} : 3 \frac{4}{5} = \frac{57}{5} : \frac{19}{5} = \frac{57}{5} \cdot \frac{5}{19} = \frac{57}{19} = 3$$ и) $$\frac{5}{7} : \frac{23}{28} = \frac{5}{7} \cdot \frac{28}{23} = \frac{5 \cdot 4 \cdot 7}{7 \cdot 23} = \frac{20}{23}$$ к) $$\frac{36}{47} : 18 = \frac{36}{47} \cdot \frac{1}{18} = \frac{36}{47 \cdot 18} = \frac{2}{47}$$ л) $$\frac{16}{17} : 8 = \frac{16}{17} \cdot \frac{1}{8} = \frac{16}{17 \cdot 8} = \frac{2}{17}$$ м) $$12 : \frac{6}{7} = 12 \cdot \frac{7}{6} = 2 \cdot 7 = 14$$