用2 7 8 9这几个数字怎么算能最后等于24
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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
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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