a) $$ \frac{5}{7} : \frac{3}{8} = \frac{5}{7} \cdot \frac{8}{3} = \frac{5 \cdot 8}{7 \cdot 3} = \frac{40}{21} = 1 \frac{19}{21} $$
Ответ: $$1 \frac{19}{21}$$
б) $$ \frac{5}{9} : \frac{10}{27} = \frac{5}{9} \cdot \frac{27}{10} = \frac{5 \cdot 27}{9 \cdot 10} = \frac{1 \cdot 3}{1 \cdot 2} = \frac{3}{2} = 1 \frac{1}{2} $$
Ответ: $$1 \frac{1}{2}$$
в) $$ 4 \frac{4}{9} : 2 \frac{2}{3} = \frac{4 \cdot 9 + 4}{9} : \frac{2 \cdot 3 + 2}{3} = \frac{36+4}{9} : \frac{6+2}{3} = \frac{40}{9} : \frac{8}{3} = \frac{40}{9} \cdot \frac{3}{8} = \frac{40 \cdot 3}{9 \cdot 8} = \frac{5 \cdot 1}{3 \cdot 1} = \frac{5}{3} = 1 \frac{2}{3} $$
Ответ: $$1 \frac{2}{3}$$
г) $$ 32 : \frac{8}{9} = 32 \cdot \frac{9}{8} = \frac{32 \cdot 9}{8} = \frac{4 \cdot 9}{1} = 36 $$
Ответ: $$36$$
д) $$ \frac{12}{13} : 6 = \frac{12}{13} \cdot \frac{1}{6} = \frac{12 \cdot 1}{13 \cdot 6} = \frac{2 \cdot 1}{13 \cdot 1} = \frac{2}{13} $$
Ответ: $$ \frac{2}{13}$$