(30 − 15) * 5 + (41 − 39) = 15 * 5 + 2 = (10 + 5) * 5 + 2 = 50 + 25 + 2 = 50 + 27 = 77
96 : (17 − 9) + 26 * 2 = 96 : 8 + (20 + 6) * 2 = (80 + 16) : 8 + (40 + 12) = (10 + 2) + 52 = 12 + 52 = 64
52 : 4 − 15 * 3 : 9 = (40 + 12) : 4 − (10 + 5) * 3 : 9 = 10 + 3 − (30 + 15) : 9 = 13 − 45 : 9 = 13 − 5 = 8
75 : 25 * 18 = 3 * 18 = 3 * (10 + 8) = 30 + 24 = 54
84 : (19 + 2) = 84 : 21 = 4
5 * (76 : 19) = 5 * 4 = 20
45 : 15 * 12 = 3 * 12 = 36
14 * (64 : 16) = 14 * 4 = (10 + 4) * 4 = 40 + 16 = 56
2 * 24 : 12 = 2 * (20 + 4) : 12 = (40 + 8) : 12 = 48 : 12 = 4