801. Сократите дроби: a) \(\frac{20}{118}, \frac{236}{444}, \frac{66}{102}, \frac{128}{28}\) б) \(\frac{108}{72}, \frac{36}{243}, \frac{120}{168}, \frac{720}{640}\)

a)

1. $$\frac{20}{118} = \frac{20:2}{118:2} = \frac{10}{59}$$
2. $$\frac{236}{444} = \frac{236:4}{444:4} = \frac{59}{111}$$
3. $$\frac{66}{102} = \frac{66:6}{102:6} = \frac{11}{17}$$
4. $$\frac{128}{28} = \frac{128:4}{28:4} = \frac{32}{7}$$

б)

1. $$\frac{108}{72} = \frac{108:36}{72:36} = \frac{3}{2}$$
2. $$\frac{36}{243} = \frac{36:9}{243:9} = \frac{4}{27}$$
3. $$\frac{120}{168} = \frac{120:24}{168:24} = \frac{5}{7}$$
4. $$\frac{720}{640} = \frac{720:80}{640:80} = \frac{9}{8}$$

Ответ: a) $$\frac{10}{59}$$, $$\frac{59}{111}$$, $$\frac{11}{17}$$, $$\frac{32}{7}$$; б) $$\frac{3}{2}$$, $$\frac{4}{27}$$, $$\frac{5}{7}$$, $$\frac{9}{8}$$