[tex]a) \ 1\frac{2}{7}:\frac{4}{5}=\frac{9}{7}\cdot\frac{5}{4} = \frac{45}{28} = 1\frac{17}{28}\\\\\\b) \ 2\frac{7}{10}:1\frac{2}{7} =\frac{27}{10}:\frac{9}{7} = \frac{27}{10}\cdot\frac{7}{9} = \frac{3}{10}\cdot7 = \frac{21}{10} = 2\frac{1}{10}\\\\\\c) \ 3\frac{3}{4}:1\frac{7}{8} = \frac{15}{4}:\frac{15}{8} = \frac{15}{4}\cdot\frac{8}{15} =\frac{8}{2} = 4[/tex]
