А) 30/48 + 12/48 + 28/48 = 70/48 = 1 22/48 = 1 11/24
б) 40/48 - 18/48 + 4/48 = 26/48 = 13/24
в) 18/42 + 33/42 - 4/42 = 47/42 = 1 5/42
д) 52/72 - 3/72 -(29/72+12/72) = 49/72-41/72 = 8/72 = 1/9
е) (35/40 - 32/40)+(2/40+10/40)+20/40 = 3/40+12/40+20/40=45/40 = 1 5/40 = 1 1/8
г не получился