在《2 8 8 9》四个数字中加运算符号就等于24
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(9-8+2)*8=24
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8*(2+9-8)=24
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1: (2 - 8 + 9) × 8
2: ((2 - 8) + 9) × 8
3: (2 - (8 - 9)) × 8
4: (2 + 9 - 8) × 8
5: ((2 + 9) - 8) × 8
6: (2 + (9 - 8)) × 8
7: 8 × (2 - 8 + 9)
8: 8 × ((2 - 8) + 9)
9: 8 × (2 - (8 - 9))
10: 8 × (2 + 9 - 8)
11: 8 × ((2 + 9) - 8)
12: 8 × (2 + (9 - 8))
13: 8 × (9 + 2 - 8)
14: 8 × ((9 + 2) - 8)
15: 8 × (9 + (2 - 8))
16: 8 × (9 - 8 + 2)
17: 8 × ((9 - 8) + 2)
18: 8 × (9 - (8 - 2))
19: (9 + 2 - 8) × 8
20: ((9 + 2) - 8) × 8
21: (9 + (2 - 8)) × 8
22: (9 - 8 + 2) × 8
23: ((9 - 8) + 2) × 8
24: (9 - (8 - 2)) × 8
2: ((2 - 8) + 9) × 8
3: (2 - (8 - 9)) × 8
4: (2 + 9 - 8) × 8
5: ((2 + 9) - 8) × 8
6: (2 + (9 - 8)) × 8
7: 8 × (2 - 8 + 9)
8: 8 × ((2 - 8) + 9)
9: 8 × (2 - (8 - 9))
10: 8 × (2 + 9 - 8)
11: 8 × ((2 + 9) - 8)
12: 8 × (2 + (9 - 8))
13: 8 × (9 + 2 - 8)
14: 8 × ((9 + 2) - 8)
15: 8 × (9 + (2 - 8))
16: 8 × (9 - 8 + 2)
17: 8 × ((9 - 8) + 2)
18: 8 × (9 - (8 - 2))
19: (9 + 2 - 8) × 8
20: ((9 + 2) - 8) × 8
21: (9 + (2 - 8)) × 8
22: (9 - 8 + 2) × 8
23: ((9 - 8) + 2) × 8
24: (9 - (8 - 2)) × 8
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【9-(8-2)】*8
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