4, 5, 7, 2的24点答案：
1: (4 × (5 + 7)) ÷ 2
2: 4 × (5 + 7) ÷ 2
3: 4 × ((5 + 7) ÷ 2)
4: (4 × (7 + 5)) ÷ 2
5: 4 × (7 + 5) ÷ 2
6: 4 × ((7 + 5) ÷ 2)
7: (4 - 2) × (5 + 7)
8: 4 ÷ 2 ×(5 + 7)
9: (4 ÷ 2) × (5 + 7)
10: 4 ÷ (2 ÷ (5 + 7))
11: (4 - 2) × (7 + 5)
12: 4 ÷ 2 ×(7 + 5)
13: (4 ÷ 2) × (7 + 5)
14: 4 ÷ (2 ÷ (7 + 5))
15: (5 + 7) × (4 - 2)
16: (5 + 7) × 4 ÷ 2
17: ((5 + 7) × 4) ÷ 2
18: (5 + 7) × (4 ÷ 2)
19: (5 + 7) ÷ 2 × 4
20: ((5 + 7) ÷ 2) × 4
21: (5 + 7) ÷ (2 ÷ 4)
22: (7 + 5) × (4 - 2)
23: (7 + 5) × 4 ÷ 2
24: ((7 + 5) × 4) ÷ 2
25: (7 + 5) × (4 ÷ 2)
26: (7 + 5) ÷ 2 × 4
27: ((7 + 5) ÷ 2) × 4
28: (7 + 5) ÷ (2 ÷ 4)
温馨提示：答案为网友推荐，仅供参考