2. 解:(1)原式=
=0
1. 解：原式＝2+1－9+1 ···························································································· 4分
＝－5 6分
65. 
；66. 1.56×109
59. 103 60. －5；61.
；62.6；63. 
；64. 1.58×1011
57.6； 58. 6.80×108
56. 9.1×104
50. 
；51. 
；52. ；53. 2008；54. 
；55. 15℃
44. 6.8× 108 45.5；46. 
；47.2；48. 
；49. 3；1；
42. 
；43. 
38. 
；39.1；40. -6；41. 
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