计算24点，快拉。。。。

1: 1 × 2 × 9 + 6
2: (1 × 2) × 9 + 6
3: (1 × 2 × 9) + 6
4: ((1 × 2) × 9) + 6
5: (1 × (2 × 9)) + 6
6: 1 × (2 × 9) + 6
7: 1 × (2 × 9 + 6)
8: 1 × ((2 × 9) + 6)
9: 1 × 6 + 2 × 9
10: (1 × 6) + 2 × 9
11: 1 × (6 + 2 × 9)
12: 1 × (6 + (2 × 9))
13: 1 × 6 +(2 × 9)
14: (1 × 6) + (2 × 9)
15: 1 × 6 + 9 × 2
16: (1 × 6) + 9 × 2
17: 1 × (6 + 9 × 2)
18: 1 × (6 + (9 × 2))
19: 1 × 6 +(9 × 2)
20: (1 × 6) + (9 × 2)
21: 1 × 9 × 2 + 6
22: (1 × 9) × 2 + 6
23: (1 × 9 × 2) + 6
24: ((1 × 9) × 2) + 6
25: (1 × (9 × 2)) + 6
26: 1 × (9 × 2) + 6
27: 1 × (9 × 2 + 6)
28: 1 × ((9 × 2) + 6)
29: 2 × 1 × 9 + 6
30: (2 × 1) × 9 + 6
31: (2 × 1 × 9) + 6
32: ((2 × 1) × 9) + 6
33: (2 × (1 × 9)) + 6
34: 2 × (1 × 9) + 6
35: 2 ÷ 1 × 9 + 6
36: (2 ÷ 1) × 9 + 6
37: (2 ÷ 1 × 9) + 6
38: ((2 ÷ 1) × 9) + 6
39: (