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題目列表(包括答案和解析)

1、集合A={-1,0,1},B={-2,-1,0},則A∪B=
{-2,-1,0,1}

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2、命題“存在x∈R,使得x2+2x+5=0”的否定是
對任意x∈R,都有x2+2x+5≠0

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3、在等差數(shù)列{an}中,a2+a5=19,S5=40,則a10
29

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5、函數(shù)y=a2-x+1(a>0,a≠1)的圖象恒過定點P,則點P的坐標為
(2,2)

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一.選擇題

1―5  CBABA   6―10  CADDA

二.填空題

11.       12.()       13.2          14.         15.

16.(1,4)

三.解答題

數(shù)學(xué)理數(shù)學(xué)理17,解:①         =2(1,0)                      (2分)             

        ?,                                        (4分)

?

        cos              =

 

        由,  ,    即B=              (6分)

                                               (7分)

                                                        (9分)

,                                                         (11分)

的取值范圍是(,1                                                      (13分)

18.解:①設(shè)雙曲線方程為:  ()                                 (1分)

由橢圓,求得兩焦點,                                           (3分)

,又為一條漸近線

, 解得:                                                     (5分)

                                                    (6分)

②設(shè),則                                                      (7分)

      

?                             (9分)

,  ?              (10分)

                                                (11分)

  ?

?                                        (13分)

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  • <strike id="yyos4"></strike>

      單減區(qū)間為[]        (6分)

     

    ②(i)當                                                      (8分)

    (ii)當,

    ,  (),,

    則有                                                                     (10分)

    ,

                                                   (11分)

      在(0,1]上單調(diào)遞減                     (12分)

                                                     (13分)

    20.解:①       

                                                            (2分)

    從而數(shù)列{}是首項為1,公差為C的等差數(shù)列

      即                                (4分)

     

       即………………※              (6分)

    當n=1時,由※得:c<0                                                    (7分)

    當n=2時,由※得:                                                 (8分)

    當n=3時,由※得:                                                 (9分)

        (

                                              (11分)

                             (12分)

    綜上分析可知,滿足條件的實數(shù)c不存在.                                    (13分)

    21.解:①設(shè)過A作拋物線的切線斜率為K,則切線方程:

                                                                    (2分)

        即

                                                                                                       (3分)

    ②設(shè)   又

         

                                                             (4分)

    同理可得 

                                                    (5分)

    又兩切點交于  ,

                                   (6分)

    ③由  可得:

     

                                                    (8分)

                      (9分)

     

     

     

                                                         (11分)

    當且僅當,取 “=”,此時

                                           (12分)

    22.①證明:由,    

      即證

      ()                                    (1分)

      

          即:                          (3分)

      ()    

       

       

                                                             (6分)

    ②由      

    數(shù)列

                                                  (8分)

    由①可知, 

                        (10分)

    由錯位相減法得:                                       (11分)

                                        (12分)

     

     


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