4) 3 17/20 : 11/11 = 77/20 * 12/11 = 42/10 = 21/5 = 4 1/5 = тили

$$3 \frac{17}{20} : \frac{1}{11} = \frac{77}{20} \cdot \frac{11}{1} = \frac{77}{20} \cdot \frac{1}{11} = \frac{42}{10} = \frac{21}{5} = 4 \frac{1}{5}$$

Ответ:$$4 \frac{1}{5}$$