а) -11.7 + 42 = 30.3
б) (-6.3 + 16.8) : 12 = 10.5 : 12 = 0.875
в) 5.7 - 7.2 : 0.6 = 5.7 - 12 = -6.3
г) 1.54 + 0.5 * (-1.3) = 1.54 - 0.65 = 0.89
д) 3/4 : 10/35 = 3/4 * 35/10 = 105/40 = 21/8 = 2.625
е) (5/7 - 3/35) * 7/44 = (25/35 - 3/35) * 7/44 = 22/35 * 7/44 = (22*7)/(35*44) = 154/1540 = 1/10 = 0.1