5 5 7 9 算24

1: (7 + 9) × 2 - 8
2: ((7 + 9) × 2) - 8
3: (9 + 7) × 2 - 8
4: ((9 + 7) × 2) - 8
5: (2 × (7 + 9)) - 8
6: 2 × (7 + 9) - 8
7: (2 × (9 + 7)) - 8
8: 2 × (9 + 7) - 8

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2 × (9 + 7) - 8

一楼的混乱啊.

79-55=25

(7-9/5)*5=24

7 5 5 9

75/5+9=24