Răspuns:
[tex] \frac{18}{4} + \frac{110}{55} = \frac{990}{220} + \frac{440}{220} \\ \frac{18}{4} = > amplificat \: cu \: 55 \\ \frac{110}{55} = > amplificat \: cu \: 4 \\ \frac{990}{220} + \frac{440}{220} \\ \frac{1430}{220} = > simpl. \: 22 = \frac{65}{10} simpl. \: 5 = \frac{13}{2}[/tex]
