exxxxxxxxx 3 URGENŤ.

[tex]\left| \dfrac{-2}{7}\right|+\left(\dfrac{-3}{4}\right)-(-0,5)= \dfrac{2}{7}-\dfrac{3}{4}+\dfrac{1}{2}=\dfrac{8-21+14}{28}=\dfrac{1}{28}[/tex]