39: 3*4 64: 2*3 48: 4*8 100-3*4 6*9+48: 6 66: 3*2-5 84-(48+26) 23+(75-48) 53-(53-40)

39:3×4 = 13×4 = 52
64:2×3 = 32×3 = 96
48:4×8 = 12×8 = 96
100-3×4 = 100-12 = 88
6×9+48:6 = 54 + 8 = 62
66:3×2-5 = 22×2-5 = 44-5 = 39
84-(48+26) = 84 - 74 = 10
23+(75-48) = 23 + 27 = 50
53-(53-40) = 53 - 13 = 40