Вычисли сумму а) 11/30 + 7/12 б) 1/27+5/18 в) 1/6+1/10+1/15 г) 3/7+1/6+5/14 д) 5/12+2/9+1/18 е) 1/2+1/3+1/9

а) 11 / 30 + 7 / 12 = 22 / 60 + 35 / 60 = 57 / 60 = 19 / 20.б) 1 / 27 + 5 / 18 = 2 / 54 + 15 / 54 = 17 / 54.в) 1 / 6 + 1 / 10 + 1 / 15 = 5 / 30 + 3 / 30 + 2 / 30 = 10 / 30 = 1 / 3.г) 3 / 7 + 1 / 6 + 5 / 14 = 18 / 42 + 7 / 42 + 15 / 42 = 40 / 42 = 20 / 21.д) 5 / 12 + 2 / 9 + 1 / 18 = 5 / 36 + 8 / 36 + 2 / 36 = 25 / 36.е) 1 / 2 +1 / 3 +1 / 9 = 9 / 18 + 6 / 18 + 2 / 18 = 17 / 18.