题目列表(包括答案和解析)
3. 解：原式＝
＝
＝
2. 解：原式
·························································· 4分
·························································································································· 6分
当
，
时，
原式
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1.
68. (x-1)2
56. 
57. 
58. 
59. 
60. 
或
61. 
62. 
63. 
64. (a+2)(a-2) 65. 
66. 
67. 
51. a(a-1);3
; 52. 
53. 
54. (x+2)(x－2) 55. 
45. -8x6 46. －2 47. 48. 20 49. 12n 50. 
30. 8a3 31. 
32. 33. 
34. 35. 
36. (x+1)(x－1) 37. 
38.3
39. (x+3)(x－1) 40. 
41. 
42. a
43. 
；44. －3x2
25. 26. 28元
27. 
28. 
29. 
20. 
21. (x+2)(x-2) 22. 
23. x(x+2)(x-2) 24. 
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