用2、4、4、5算24点
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1: (2 + 5) × 4 - 4
2: ((2 + 5) × 4) - 4
3: (2 × 5 - 4) × 4
4: ((2 × 5) - 4) × 4
5: (4 × (2 + 5)) - 4
6: 4 × (2 + 5) - 4
7: 4 × (2 × 5 - 4)
8: 4 × ((2 × 5) - 4)
9: (4 + 4) × (5 - 2)
10: (4 × (5 + 2)) - 4
11: 4 × (5 + 2) - 4
12: 4 × (5 × 2 - 4)
13: 4 × ((5 × 2) - 4)
14: (5 + 2) × 4 - 4
15: ((5 + 2) × 4) - 4
16: (5 - 2) × (4 + 4)
17: (5 × 2 - 4) × 4
18: ((5 × 2) - 4) × 4
2: ((2 + 5) × 4) - 4
3: (2 × 5 - 4) × 4
4: ((2 × 5) - 4) × 4
5: (4 × (2 + 5)) - 4
6: 4 × (2 + 5) - 4
7: 4 × (2 × 5 - 4)
8: 4 × ((2 × 5) - 4)
9: (4 + 4) × (5 - 2)
10: (4 × (5 + 2)) - 4
11: 4 × (5 + 2) - 4
12: 4 × (5 × 2 - 4)
13: 4 × ((5 × 2) - 4)
14: (5 + 2) × 4 - 4
15: ((5 + 2) × 4) - 4
16: (5 - 2) × (4 + 4)
17: (5 × 2 - 4) × 4
18: ((5 × 2) - 4) × 4
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