24点 2,3,4,12.用加，减，乘除，乘方计算

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