Răspuns :
[tex]\it f(x) =3x-1[/tex]
[tex]\it f\left(\dfrac{1}{2}\right) = 3\cdot\dfrac{1}{2}-1 =\dfrac{3}{2}-1 =\dfrac{3}{2} -\dfrac{2}{2} = \dfrac{3-2}{2} =\dfrac{1}{2}[/tex]
[tex]\it f\left(\dfrac{1}{2}\right) = 3\cdot\dfrac{1}{2}-1 =\dfrac{3}{2}-1 =\dfrac{3}{2} -\dfrac{2}{2} = \dfrac{3-2}{2} =\dfrac{1}{2}[/tex]