1 2 4 9怎么算24?

1 2 4 9怎么算24?
1 2 4 9怎么算24?

1 2 4 9怎么算24?
1, 2, 4, 9的24点答案：
1: (1 + 9) × 2 + 4
2: ((1 + 9) × 2) + 4
3: (2 × (1 + 9)) + 4
4: 2 × (1 + 9) + 4
5: 2 × (4 - 1 + 9)
6: 2 × ((4 - 1) + 9)
7: 2 × (4 - (1 - 9))
8: 2 × (4 + 9 - 1)
9: 2 × ((4 + 9) - 1)
10: 2 × (4 + (9 - 1))
11: (2 × (9 + 1)) + 4
12: 2 × (9 + 1) + 4
13: 2 × (9 - 1 + 4)
14: 2 × ((9 - 1) + 4)
15: 2 × (9 - (1 - 4))
16: 2 × (9 + 4 - 1)
17: 2 × ((9 + 4) - 1)
18: 2 × (9 + (4 - 1))
19: 4 + (1 + 9) × 2
20: 4 + ((1 + 9) × 2)
21: (4 - 1 + 9) × 2
22: ((4 - 1) + 9) × 2
23: (4 - (1 - 9)) × 2
24: 4 + (2 × (1 + 9))
25: 4 + 2 ×(1 + 9)
26: 4 + (2 × (9 + 1))
27: 4 + 2 ×(9 + 1)
28: 4 + (9 + 1) × 2
29: 4 + ((9 + 1) × 2)
30: (4 + 9 - 1) × 2
31: ((4 + 9) - 1) × 2
32: (4 + (9 - 1)) × 2
33: 4 × (9 - (1 + 2))
34: 4 × (9 - 1 - 2)
35: 4 × ((9 - 1) - 2)
36: 4 × (9 - (2 + 1))
37: 4 × (9 - 2 - 1)
38: 4 × ((9 - 2) - 1)
39: (9 + 1) × 2 + 4
40: ((9 + 1) × 2) + 4
41: (9 - (1 + 2)) × 4
42: (9 - 1 - 2) × 4
43: ((9 - 1) - 2) × 4
44: (9 - 1 + 4) × 2
45: ((9 - 1) + 4) × 2
46: (9 - (1 - 4)) × 2
47: (9 - (2 + 1)) × 4
48: (9 - 2 - 1) × 4
49: ((9 - 2) - 1) × 4
50: (9 + 4 - 1) × 2
51: ((9 + 4) - 1) × 2
52: (9 + (4 - 1)) × 2