[tex]....=\dfrac{3^4}{3^5}:\dfrac{1}{9}+\dfrac83\cdot\dfrac{24}{16}=[/tex] si dupa ce facem simplificarile si tinem cont ca a imparti o fractie la alta inseamna a o inmulti pe prima cu inversa celei de a doua, obtinem
[tex]....=\dfrac13\cdot9+4=3+4=7\in N[/tex]
