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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(duì)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(diǎn)P,則點(diǎn)P的坐標(biāo)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(diǎn),                                           (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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                單減區(qū)間為[]        (6分)

               

              ②(i)當(dāng)                                                      (8分)

              (ii)當(dāng),

              ,  (),,

              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(xiàng)為1,公差為C的等差數(shù)列

                即                                (4分)

               

                 即………………※              (6分)

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

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

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

              當(dāng)

                  (

                                                        (11分)

                                       (12分)

              綜上分析可知,滿足條件的實(shí)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(diǎn)交于 

                                             (6分)

              ③由  可得:

               

                                                              (8分)

                                (9分)

               

              當(dāng) 

              當(dāng) 

                                                                   (11分)

              當(dāng)且僅當(dāng),取 “=”,此時(shí)

                                                     (12分)

              22.①證明:由   

                即證

                ()                                    (1分)

              當(dāng)  

                    即:                          (3分)

                ()    

              當(dāng)   

                 

                                                                       (6分)

              ②由      

              數(shù)列

                                                            (8分)

              由①可知, 

                                  (10分)

              由錯(cuò)位相減法得:                                       (11分)

                                                  (12分)

               

               


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