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