Răspuns :
1,2=12/10= 6/5
6/5 × (1/3 +2/5) = 6/5 × ( 5/15 + 6/15)= 6/5 × 11/15 = (2x11) / 5x5=22/25= 0,88
6/5 × (1/3 +2/5) = 6/5 × ( 5/15 + 6/15)= 6/5 × 11/15 = (2x11) / 5x5=22/25= 0,88