48: 8+32-54: 9+7•8. 100-6•2: 3•9-6•9. 7•7-(7•9-19)+6•4. 9•(16-5)-54: 9•8+42. 9•9-48: (39-33)•7+66. 45: 5•3+16: 2•5-28. 8•7-16: 4•7-19+49.

48:8+32-54:9+7*8=6+32-6+56=88
100-6*2:3*9-6*9=100-36-54=10
7*7-(7*9-19)+6*4=49-44+24=29
9*(16-5)-54:9*8+42=9*11-6*8+42=99-48+42=93
9*9-48:(39-33)*7+66=81-48:6*7+66=81-56+66=91
45:5*3+16:2*5-28=27+40-28=39
8*7-16:4*7-19+49=56-28-19+49=58