в) 11/12 + 5/6 = (116 + 125)/(126) = 126/72 = 1 54/72 = 1 3/4е) 21/25 + 8/15 = (2115 + 258)/(2515) = 315/375 = 3 60/375 = 3 4/5
в) 11/12 + 5/6 = (116 + 125)/(126) = 126/72 = 1 54/72 = 1 3/4
е) 21/25 + 8/15 = (2115 + 258)/(2515) = 315/375 = 3 60/375 = 3 4/5