Найди сумму и разность чисел: 13/30 и 22/45; 3/14 и 4/21; 17/45 и 5/18.. Created by ЭминЮнисов. matematika-ru

13/30 + 22/45 = 39/90 + 44/90 = 83/90; 13/30 - 22/45 = 39/90 - 44/90 = - 5/90 = -1/18.3/14 + 4/21 = 9/42 + 8/42 = 17/42; 3/14 - 4/21 = 9/42 - 8/42 = 1/42.17/45 + 5/18 = 34/90 + 25/90 = 59/90; 17/45 - 5/18 = 34/90 - 25/90 = 9/90 = 1/10.