Решите дроби а)2/9+5/6 б) 3/10+2/12 в)2/26+3/39 г) 7/450+8/180

А) 2/9 + 5/6 = 4/18 + 15/18 =19 /18 =1 1/18
б) 3/10 +2/12 = 18/60 + 10/60 = 28/60 =7/15
в) 2/26 + 3/39 = 1/13 + 1/13 = 2/13
г) 7/450 + 8/180 =7/450+ 2/45 = 7/450 + 20/450 = 27/450 = 3/50