1023. a) 1 1/5 : 2; б) 2 2/5 : 3; в) 9 : 2 1/4; д) 2 : 5 1/3; e) 2 : 7/5; ж) 12 : 2/3;

a) $$1 \frac{1}{5} : 2 = \frac{6}{5} : 2 = \frac{6}{5} \cdot \frac{1}{2} = \frac{6}{10} = \frac{3}{5}$$

б) $$2 \frac{2}{5} : 3 = \frac{12}{5} : 3 = \frac{12}{5} \cdot \frac{1}{3} = \frac{12}{15} = \frac{4}{5}$$

в) $$9 : 2 \frac{1}{4} = 9 : \frac{9}{4} = 9 \cdot \frac{4}{9} = \frac{9 \cdot 4}{9} = 4$$

д) $$2 : 5 \frac{1}{3} = 2 : \frac{16}{3} = 2 \cdot \frac{3}{16} = \frac{2 \cdot 3}{16} = \frac{6}{16} = \frac{3}{8}$$

e) $$2 : \frac{7}{5} = 2 \cdot \frac{5}{7} = \frac{2 \cdot 5}{7} = \frac{10}{7} = 1 \frac{3}{7}$$

ж) $$12 : \frac{2}{3} = 12 \cdot \frac{3}{2} = \frac{12 \cdot 3}{2} = \frac{36}{2} = 18$$

Ответ: a) $$\frac{3}{5}$$; б) $$\frac{4}{5}$$; в) $$4$$; д) $$\frac{3}{8}$$; e) $$1 \frac{3}{7}$$; ж) $$18$$