3.8 :: 23; B) 11:38:17; 7 21 8' 21 9 9 5 6 11 r) :111.

в) $$1\frac{11}{21} \cdot 3\frac{8}{9} : 1\frac{7}{9} = \frac{32}{21} \cdot \frac{35}{9} : \frac{16}{9} = \frac{32}{21} \cdot \frac{35}{9} \cdot \frac{9}{16} = \frac{32 \cdot 35 \cdot 9}{21 \cdot 9 \cdot 16} = \frac{10080}{3024} = \frac{10}{3} = 3\frac{1}{3}$$

Ответ: $$3\frac{1}{3}$$

г) $$\frac{5}{6} \cdot \frac{6}{11} : 1\frac{1}{11} = \frac{5}{6} \cdot \frac{6}{11} : \frac{12}{11} = \frac{5}{6} \cdot \frac{6}{11} \cdot \frac{11}{12} = \frac{5 \cdot 6 \cdot 11}{6 \cdot 11 \cdot 12} = \frac{330}{792} = \frac{5}{12}$$

Ответ: $$\frac{5}{12}$$