4,8,6,1如何用加减乘除计算得24（每个符号都得用到，每个只能用一次)

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