Упростите дроби(исключите целые и сократите) 13 баллов

Решите задачу:

$\displaystyle \tt \frac{21}{28}=\frac{3\cdot7}{4\cdot7}=\frac{3}{4}=0,75;\\\\\\\frac{23}{8}=\frac{2\cdot8+7}{8}=\frac{2\cdot8}{8}+\frac{7}{8}=2\frac{7}{8};\\\\\\\frac{24}{35}=\frac{8\cdot3}{5\cdot7}=\frac{24}{35};\\\\\\\frac{36}{48}=\frac{12\cdot3}{12\cdot4}=\frac{3}{4}=0,75;\\\\\\\frac{12}{4}=\frac{3\cdot4}{4}=3;\\\\\\\frac{4}{12}=\frac{4}{3\cdot4}=\frac{1}{3};$

$\displaystyle \tt 1\frac{15}{18}=1+\frac{5\cdot3}{6\cdot3}=1\frac{5}{6};\\\\\\\frac{27}{6}=\frac{9\cdot3}{2\cdot3}=\frac{9}{2}=4,5;\\\\\\5\frac{8}{5}=5+\frac{5}{5}+\frac{3}{5}=6\frac{3}{5}=6,6;\\\\\\1\frac{18}{6}=1+\frac{3\cdot6}{6}=1+3=4;\\\\\\\frac{75}{100}=\frac{25\cdot3}{25\cdot4}=\frac{3}{4}=0,75;\\\\\\4\frac{24}{21}=4+\frac{21+3}{21}=4+\frac{21}{21}+\frac{3}{3\cdot7}=5\frac{1}{7};$