\(\frac{\frac{28}{31}:\frac{9}{31}}{\frac{8}{9}:\frac{4}{9}}\)
\(=\frac{\frac{28}{31}.\frac{31}{9}}{\frac{8}{9}.\frac{9}{4}}\)
\(=\frac{\frac{28}{9}}{2}\)
\(=\frac{28}{9}.\frac{1}{2}\)
=\(\frac{14}{9}\)
=\(\frac{\frac{28}{31}.\frac{31}{9}}{\frac{8}{9}.\frac{9}{4}}=\frac{\frac{28}{9}}{2}\)=\(\frac{28}{9}\):2=\(\frac{28}{9}\).2=\(\frac{56}{9}\)