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