$\dfrac{9}{7}\times\dfrac{5}{7}$=

$(\dfrac{-2}{7})\times\dfrac{5}{7}$=

$(\dfrac{-3}{7})+\dfrac{1}{4}$=

$\dfrac{7}{6} : \dfrac{6}{7}$=

$(\dfrac{-5}{8}) : \dfrac{1}{2}$=

$\dfrac{5}{6}+\dfrac{1}{3}$=

$\dfrac{3}{4} : (\dfrac{-7}{5})$=

$(\dfrac{-5}{6}) : (\dfrac{-2}{3})$=

$\dfrac{\dfrac{4}{3}}{\dfrac{3}{7}}$=

$\dfrac{8}{7}\times(\dfrac{-5}{8})$=