a)
[tex]\dfrac{2}{3}+\dfrac{3}{\not5}\cdot\dfrac{\not5}{6} =\dfrac{2}{3}+ \dfrac{3}{6} =\dfrac{4}{6}+\dfrac{3}{6}=\dfrac{7}{6} =1\dfrac{1}{6}[/tex]
b)
Introduc intregii in fractie:
[tex]\dfrac{\not3}{2}\cdot\dfrac{8}{\not3}+5 = \dfrac{8}{2} +5 =4+5=9.[/tex]