1, 3, 7, 8的24点答案：
1: 3 ÷ (1 - 7 ÷ 8)
2: 3 ÷ (1 - (7 ÷ 8))
3: (7 - (1 + 3)) × 8
4: (7 - 1 - 3) × 8
5: ((7 - 1) - 3) × 8
6: (7 - (3 + 1)) × 8
7: (7 - 3 - 1) × 8
8: ((7 - 3) - 1) × 8
9: 8 × (7 - (1 + 3))
10: 8 × (7 - 1 - 3)
11: 8 × ((7 - 1) - 3)
12: 8 × (7 - (3 + 1))
13: 8 × (7 - 3 - 1)
14: 8 × ((7 - 3) - 1)
(7+9)*2 - 8 = 24
(7-3-1)*8=24
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