2531中间加运算符号等于24的算式

1: (1 + 2) × (3 + 5)
2: (1 + 2 + 5) × 3
3: ((1 + 2) + 5) × 3
4: (1 + (2 + 5)) × 3
5: (1 + 2) × (5 + 3)
6: (1 + 5 + 2) × 3
7: ((1 + 5) + 2) × 3
8: (1 + (5 + 2)) × 3
9: (2 + 1) × (3 + 5)
10: (2 + 1 + 5) × 3
11: ((2 + 1) + 5) × 3
12: (2 + (1 + 5)) × 3
13: (2 + 1) × (5 + 3)
14: (2 + 3) × 5 - 1
15: ((2 + 3) × 5) - 1
16: 2 × (3 × (5 - 1))
17: 2 × 3 ×(5 - 1)
18: (2 × 3) × (5 - 1)
19: (2 + 5 + 1) × 3
20: ((2 + 5) + 1) × 3
21: (2 + (5 + 1)) × 3
22: (2 × (5 - 1)) × 3
23: 2 × (5 - 1) × 3
24: 2 × ((5 - 1) × 3)
25: 3 × (1 + 2 + 5)
26: 3 × ((1 + 2) + 5)
27: 3 × (1 + (2 + 5))
28: 3 × (1 + 5 + 2)
29: 3 × ((1 + 5) + 2)
30: 3 × (1 + (5 + 2))
31: 3 × (2 + 1 + 5)
32: 3 × ((2 + 1) + 5)
33: 3 × (2 + (1 + 5))
34: (3 + 2) × 5 - 1
35: ((3 + 2) × 5) - 1
36: 3 × (2 + 5 + 1)
37: 3 × ((2 + 5) + 1)<