[tex]\it \dfrac{8}{4}=2\\ \\ a)\ A\cap \mathbb{N}=\{0;\ \dfrac{8}{4};\ 4\}\\ \\ b)\ A\cap \mathbb{Z}=\{-5;\ -2,\ 0;\ \dfrac{8}{4};\ 4\}\\ \\ d)\ A\backslash \mathbb{Z}=\{\dfrac{1}{3};\ \ 0,(4)\}[/tex]
