求逗24点的难题及答案，谢谢了

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