1229二十四点怎么算

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

ok.?