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都用正数计算即可,因为5=-(-5)!
1: (3 - 7) × (5 - 11)
2: (5 - 11) × (3 - 7)
3: (7 - 3) × (11 - 5)
4: (7 × 11 - 5) ÷ 3
5: ((7 × 11) - 5) ÷ 3
6: (11 - 5) × (7 - 3)
1: (3 - 7) × (5 - 11)
2: (5 - 11) × (3 - 7)
3: (7 - 3) × (11 - 5)
4: (7 × 11 - 5) ÷ 3
5: ((7 × 11) - 5) ÷ 3
6: (11 - 5) × (7 - 3)
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