Zgjidhja e ushtrimit 6

Gjeni shumën ose ndryshesën e thyesave.

1. $\dfrac{1}{2x}+\dfrac{3}{x}$
2. $\dfrac{2}{3y}+\dfrac{1}{y}$
3. $\dfrac{3}{4x}+\dfrac{1}{2x}$
4. $\dfrac{3}{xy}+\dfrac{2}{y}$