[tex]\it Inversa\ frac\c{\it t}iei\ \dfrac{2}{9}\ este\ frac\c{\it t}ia\ \dfrac{9}{2} \\ \\ \\ Inversa\ frac\c{\it t}iei\ \dfrac{8}{5}\ este\ frac\c{\it t}ia\ \dfrac{5}{8}\\ \\ \\ 3\dfrac{4}{7}=\dfrac{25}{7};\ \ \ \ Inversa\ frac\c{\it t}iei\ \dfrac{25}{7}\ este\ frac\c{\it t}ia\ \dfrac{7}{25}[/tex]