2, 1, 3, 5的24点答案：
1: (2 + 1) × (3 + 5)
2: (2 + 1 + 5) × 3
3: ((2 + 1) + 5) × 3
4: (2 + (1 + 5)) × 3
5: (2 + 1) × (5 + 3)
6: (2 + 3) × 5 - 1
7: ((2 + 3) × 5) - 1
8: 2 × (3 × (5 - 1))
9: 2 × 3 ×(5 - 1)
10: (2 × 3) × (5 - 1)
11: (2 + 5 + 1) × 3
12: ((2 + 5) + 1) × 3
13: (2 + (5 + 1)) × 3
14: (2 × (5 - 1)) × 3
15: 2 × (5 - 1) × 3
16: 2 × ((5 - 1) × 3)
17: (1 + 2) × (3 + 5)
18: (1 + 2 + 5) × 3
19: ((1 + 2) + 5) × 3
20: (1 + (2 + 5)) × 3
21: (1 + 2) × (5 + 3)
22: (1 + 5 + 2) × 3
23: ((1 + 5) + 2) × 3
24: (1 + (5 + 2)) × 3
25: 3 × (2 + 1 + 5)
26: 3 × ((2 + 1) + 5)
27: 3 × (2 + (1 + 5))
28: (3 + 2) × 5 - 1
29: ((3 + 2) × 5) - 1
30: 3 × (2 + 5 + 1)
31: 3 × ((2 + 5) + 1)
32: 3 × (2 + (5 + 1))
33: 3 × (2 × (5 - 1))
34: 3 × 2 ×(5 - 1)
35: (3 × 2) × (5 - 1)
36: 3 × (1 + 2 + 5)
37: 3 × ((1 + 2) + 5)
38: 3 × (1 + (2 + 5))
39: 3 × (1 + 5 + 2)
40: 3 × ((1 + 5) + 2)
41: 3 × (1 + (5 + 2))
42: (3 + 5) × (2 + 1)
43: 3 × (5 + 2 + 1)
44: 3 × ((5 + 2) + 1)
45: 3 × (5 + (2 + 1))
46: (3 + 5) × (1 + 2)
47: 3 × (5 + 1 + 2)
48: 3 × ((5 + 1) + 2)
49: 3 × (5 + (1 + 2))
50: (3 × (5 - 1)) × 2
51: 3 × (5 - 1) × 2
52: 3 × ((5 - 1) × 2)
53: (5 + 2 + 1) × 3
54: ((5 + 2) + 1) × 3
55: (5 + (2 + 1)) × 3
56: (5 × (2 + 3)) - 1
57: 5 × (2 + 3) - 1
58: (5 + 1 + 2) × 3
59: ((5 + 1) + 2) × 3
60: (5 + (1 + 2)) × 3
61: (5 - 1) × 2 × 3
62: ((5 - 1) × 2) × 3
63: (5 - 1) × (2 × 3)
64: (5 - 1) × 3 × 2
65: ((5 - 1) × 3) × 2
66: (5 - 1) × (3 × 2)
67: (5 + 3) × (2 + 1)
68: (5 × (3 + 2)) - 1
69: 5 × (3 + 2) - 1
70: (5 + 3) × (1 + 2)
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