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题目列表(包括答案和解析)

求数列
1
1+
2
1
2
+
3
,…,
1
n
+
n+1
,…
的前n项和
 

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14、求数列{(-1)n•n}的前2010项的和S2010

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求数列2,4,8,16,…前十项的和.

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求数列1
1
2
,2
1
4
,3
1
8
,4
1
16
,…
前n项的和.

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求数列的前n项和:1+1,
1
a
+4,
1
a2
+7,…,
1
an-1
+3n-2,…

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一.选择题

1―5  CBABA   6―10  CADDA

二.填空题

11.       12.()       13.2          14.         15.

16.(1,4)

三.解答题

数学理数学理17,解:①         =2(1,0)                      (2分)             

        ?,                                        (4分)

?

        cos              =

 

        由,  ,    即B=              (6分)

                                               (7分)

                                                        (9分)

                                                        (11分)

的取值范围是(,1                                                      (13分)

18.解:①设双曲线方程为:  ()                                 (1分)

由椭圆,求得两焦点,                                           (3分)

,又为一条渐近线

, 解得:                                                     (5分)

                                                    (6分)

②设,则                                                      (7分)

      

?                             (9分)

,  ?              (10分)

                                                (11分)

  ?

?                                        (13分)

  单减区间为[]        (6分)

 

②(i)当                                                      (8分)

(ii)当

,  (),

则有                                                                     (10分)

                                               (11分)

  在(0,1]上单调递减                     (12分)

                                                 (13分)

20.解:①       

                                                        (2分)

从而数列{}是首项为1,公差为C的等差数列

  即                                (4分)

 

   即………………※              (6分)

当n=1时,由※得:c<0                                                    (7分)

当n=2时,由※得:                                                 (8分)

当n=3时,由※得:                                                 (9分)

    (

                                          (11分)

                         (12分)

综上分析可知,满足条件的实数c不存在.                                    (13分)

21.解:①设过A作抛物线的切线斜率为K,则切线方程:

                                                                (2分)

    即

                                                                                                   (3分)

②设   又

     

                                                         (4分)

同理可得 

                                                (5分)

又两切点交于 

                               (6分)

③由  可得:

 

                                                (8分)

                  (9分)

 

 

 

                                                     (11分)

当且仅当,取 “=”,此时

                                       (12分)

22.①证明:由   

  即证

  ()                                    (1分)

  

      即:                          (3分)

  ()    

   

   

                                                         (6分)

②由      

数列

                                              (8分)

由①可知, 

                    (10分)

由错位相减法得:                                       (11分)

                                    (12分)

 

 


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