1234算24点。很简单的。

(1+2+3)*4
1*2*3*4
(2+4)*(1+3)

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