a) 1/5+2/5 =3/5 ; 5/5+2/5=7/5 ; 4/5+2/5=6/5 ; 3/5+2/5=5/5 ;
b) 7/8+4/8=11/8 ; 8/8+4/8=12/8 ; 9/8+4/8=13/8 ; 3/8+4/8=7/8 ;
c) 5/6+2/6=7/6 ; 4/6+2/6=6/6 ; 7/6+2/6=9/6 ; 3/6+2/6=5/6 ;
Obs. Eventualele simplificari pe parcursul rezolvarii (daca lucrati cu simplificari) vei reusii sa efectuezi singura ! Succes !