a. 3 : 11 = \(\dfrac{3}{11}\)
b. -4 : 7 = \(\dfrac{-4}{7}\)
c 5 : ( -13) = \(\dfrac{5}{-13}=\dfrac{-5}{13}\)
d x : 3 \(\left(x\in z\right)\)
= \(\dfrac{x}{3}\)
\(a,3:11=\dfrac{3}{11}=\dfrac{-3}{-11}\\ b,-4:7=\dfrac{-4}{7}=\dfrac{4}{-7}\\ c,5:\left(-13\right)=\dfrac{5}{-13}=\dfrac{-5}{13}\\ d,x:3=\dfrac{x}{3}=\dfrac{-x}{-3}\)