Выполняю задание.
10.19)
а) $$0,(3) = \frac{1}{3}$$
б) $$0,(15) = \frac{5}{33}$$
в) $$0,(6) = \frac{2}{3}$$
г) $$0,(108) = \frac{4}{37}$$
10.20)
а) $$15,(3) = 15 \frac{1}{3} = \frac{46}{3}$$
б) $$2,(14) = 2 \frac{14}{99} = \frac{212}{99}$$
в) $$7,(2) = 7 \frac{2}{9} = \frac{65}{9}$$
г) $$23,(25) = 23 \frac{25}{99} = \frac{2302}{99}$$
10.21)
а) $$0,0(24) = \frac{1}{10} \cdot \frac{24}{99} = \frac{24}{990} = \frac{4}{165}$$
б) $$0,00(3) = \frac{1}{100} \cdot \frac{3}{9} = \frac{3}{900} = \frac{1}{300}$$
в) $$0,0(6) = \frac{1}{10} \cdot \frac{6}{9} = \frac{6}{90} = \frac{1}{15}$$
г) $$0,00(18) = \frac{1}{100} \cdot \frac{18}{99} = \frac{18}{9900} = \frac{1}{550}$$
10.22)
а) $$1,6(1) = 1 \frac{61-6}{90} = 1 \frac{55}{90} = 1 \frac{11}{18} = \frac{29}{18}$$
б) $$2,03(5) = 2 \frac{35-3}{900} = 2 \frac{32}{900} = 2 \frac{8}{225} = \frac{458}{225}$$
в) $$3,9(12) = 3 \frac{912-9}{990} = 3 \frac{903}{990} = 3 \frac{301}{330} = \frac{1291}{330}$$
г) $$0,7(72) = \frac{772-7}{990} = \frac{765}{990} = \frac{17}{22}$$