#a
[tex]\\ \sf{:}\dashrightarrow \dfrac{9}{4}\div \dfrac{-3}{4}=\dfrac{9}{4}\times \dfrac{4}{-3}=-3[/tex]
#b
[tex]\\ \sf{:}\dashrightarrow \dfrac{-5}{7}\div \dfrac{-1}{3}=\dfrac{-5}{7}\div -3=\dfrac{15}{7}[/tex]
#c
[tex]\\ \sf{:}\dashrightarrow \dfrac{-5}{3}\div \dfrac{1}{6}=\dfrac{-5}{3}\times 6=-10[/tex]
