[tex]a)\\\\1\frac{2}{7}:\frac{4}{5}=\frac{9}{\not{5}^1}*\frac{\not{5}^1}{4}=\frac{9}{4}=2\frac{1}{4}\\\\b)\\\\2\frac{7}{10}:1\frac{2}{7}= \frac{27}{10}: \frac{9}{7}=\frac{\not{27}^3}{10}*\frac{7}{\not{9}^1}=\frac{21}{10} =2\frac{1}{10}\\\\c)\\\\3\frac{3}{4}:1\frac{7}{8}= \frac{15}{4}: \frac{15}{8}= \frac{\not{15}^1}{\not{4}^1}*\frac{\not{8}^2}{\not{15}^1}=8[/tex]
