a) $$ \frac{5}{4} : \frac{2}{15} = \frac{5}{4} \cdot \frac{15}{2} = \frac{5 \cdot 15}{4 \cdot 2} = \frac{75}{8} = 9 \frac{3}{8} $$
Ответ: $$9 \frac{3}{8}$$
б) $$ \frac{2}{3} : \frac{8}{9} = \frac{2}{3} \cdot \frac{9}{8} = \frac{2 \cdot 9}{3 \cdot 8} = \frac{18}{24} = \frac{3}{4} $$
Ответ: $$ \frac{3}{4} $$
в) $$ \frac{64}{131} : \frac{32}{52} = \frac{64}{131} \cdot \frac{52}{32} = \frac{64 \cdot 52}{131 \cdot 32} = \frac{2 \cdot 52}{131 \cdot 1} = \frac{104}{131} $$
Ответ: $$ \frac{104}{131} $$
г) $$ \frac{64}{125} : 4 = \frac{64}{125} \cdot \frac{1}{4} = \frac{64 \cdot 1}{125 \cdot 4} = \frac{16}{125} $$
Ответ: $$ \frac{16}{125} $$
д) $$ 9 : \frac{3}{4} = 9 \cdot \frac{4}{3} = \frac{9 \cdot 4}{3} = \frac{36}{3} = 12 $$
Ответ: 12
e) $$ 9 : 4 = \frac{9}{4} = 2\frac{1}{4} $$
Ответ: $$ 2\frac{1}{4} $$