3，7，8，9只能用一次怎么算等于24
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(7 + 9 - 8) × 3 =24
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1: 3 × (7 - 8 + 9)
2: 3 × ((7 - 8) + 9)
3: 3 × (7 - (8 - 9))
4: 3 × (7 + 9 - 8)
5: 3 × ((7 + 9) - 8)
6: 3 × (7 + (9 - 8))
7: 3 × (9 + 7 - 8)
8: 3 × ((9 + 7) - 8)
9: 3 × (9 + (7 - 8))
10: 3 × (9 - 8 + 7)
11: 3 × ((9 - 8) + 7)
12: 3 × (9 - (8 - 7))
13: (7 - 8 + 9) × 3
14: ((7 - 8) + 9) × 3
15: (7 - (8 - 9)) × 3
16: (7 + 9 - 8) × 3
17: ((7 + 9) - 8) × 3
18: (7 + (9 - 8)) × 3
19: (9 + 7 - 8) × 3
20: ((9 + 7) - 8) × 3
21: (9 + (7 - 8)) × 3
22: (9 - 8 + 7) × 3
23: ((9 - 8) + 7) × 3
24: (9 - (8 - 7)) × 3
2: 3 × ((7 - 8) + 9)
3: 3 × (7 - (8 - 9))
4: 3 × (7 + 9 - 8)
5: 3 × ((7 + 9) - 8)
6: 3 × (7 + (9 - 8))
7: 3 × (9 + 7 - 8)
8: 3 × ((9 + 7) - 8)
9: 3 × (9 + (7 - 8))
10: 3 × (9 - 8 + 7)
11: 3 × ((9 - 8) + 7)
12: 3 × (9 - (8 - 7))
13: (7 - 8 + 9) × 3
14: ((7 - 8) + 9) × 3
15: (7 - (8 - 9)) × 3
16: (7 + 9 - 8) × 3
17: ((7 + 9) - 8) × 3
18: (7 + (9 - 8)) × 3
19: (9 + 7 - 8) × 3
20: ((9 + 7) - 8) × 3
21: (9 + (7 - 8)) × 3
22: (9 - 8 + 7) × 3
23: ((9 - 8) + 7) × 3
24: (9 - (8 - 7)) × 3
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