А) 3/4 + 5/7 = (21/28) + (20/28) = 41/28 или 1 13/28б) 11/18 - 5/12 = (22/36) - (15/36) = 7/36в) 9/14 + 3/4 = (18/28) + (21/28) = 39/28 или 1 11/28г) 13/18 - 7/15 = (65/90) - (42/90) = 23/90д) 11/12 - 2/3 = (11/12) - (8/12) = 3/12 или 1/4е) 7/25 + 4/10 = (28/100) + (40/100) = 68/100 или 17/25ж) 5/6 - 3/4 + 5/24 = (20/24) - (18/24) + (5/24) = 7/24з) 5/8 + 11/28 - 9/14 = (35/56) + (22/56) - (36/56) = 21/56 или 3/8
А) 3/4 + 5/7 = (21/28) + (20/28) = 41/28 или 1 13/28
б) 11/18 - 5/12 = (22/36) - (15/36) = 7/36
в) 9/14 + 3/4 = (18/28) + (21/28) = 39/28 или 1 11/28
г) 13/18 - 7/15 = (65/90) - (42/90) = 23/90
д) 11/12 - 2/3 = (11/12) - (8/12) = 3/12 или 1/4
е) 7/25 + 4/10 = (28/100) + (40/100) = 68/100 или 17/25
ж) 5/6 - 3/4 + 5/24 = (20/24) - (18/24) + (5/24) = 7/24
з) 5/8 + 11/28 - 9/14 = (35/56) + (22/56) - (36/56) = 21/56 или 3/8