2等于以下几种形式：
1. 2 = 1 + 1
2. 2 = 2/1
3. 2 = 4/2
4. 2 = 10/5
5. 2 = 20/10
6. 2 = 1/2
7. 2 = 2/4
8. 2 = 4/8
9. 2 = 8/16
10. 2 = 16/32
11. 2 = 32/64
12. 2 = 64/128
13. 2 = 1/3
14. 2 = 2/6
15. 2 = 3/9
16. 2 = 4/12
17. 2 = 5/15
18. 2 = 6/18
19. 2 = 7/21
20. 2 = 8/24
21. 2 = 9/27
22. 2 = 10/30
23. 2 = 11/33
24. 2 = 12/36
25. 2 = 13/39
26. 2 = 14/42
27. 2 = 15/45
28. 2 = 16/48
29. 2 = 17/51
30. 2 = 18/54
31. 2 = 19/57
32. 2 = 20/60
33. 2 = 21/63
34. 2 = 22/66
35. 2 = 23/69
36. 2 = 24/72
37. 2 = 25/75
38. 2 = 26/78
39. 2 = 27/81
40. 2 = 28/84
41. 2 = 29/87
42. 2 = 30/90
43. 2 = 31/93
44. 2 = 32/96
45. 2 = 33/99
46. 2 = 1/5
47. 2 = 2/10
48. 2 = 3/15
49. 2 = 4/20
50. 2 = 5/25
51. 2 = 6/30
52. 2 = 7/35
53. 2 = 8/40
54. 2 = 9/45
55. 2 = 10/50
56. 2 = 11/55
57. 2 = 12/60
58. 2 = 13/65
59. 2 = 14/68
60. 2 = 15/70
61. 2 = 16/72
62. 2 = 17/74
63. 2 = 18/76
64. 2 = 19/78
65. 2 = 20/80
66. 2 = 21/82[