13.直線與曲線的公共點(diǎn)個(gè)數(shù)是 . 查看更多

 

題目列表(包括答案和解析)

直線與曲線的公共點(diǎn)的個(gè)數(shù)是            。

查看答案和解析>>

直線與曲線有3個(gè)公共點(diǎn)時(shí),實(shí)數(shù)的取值范圍是

A.B.C.D.

查看答案和解析>>

直線與曲線有3個(gè)公共點(diǎn)時(shí),實(shí)數(shù)的取值范圍是     

 

查看答案和解析>>

直線與曲線有3個(gè)公共點(diǎn)時(shí),實(shí)數(shù)的取值范圍是

A.        B.         C.            D.

 

查看答案和解析>>

直線與曲線有3個(gè)公共點(diǎn)時(shí),實(shí)數(shù)的取值范圍是
A.B.C.D.

查看答案和解析>>

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)

    <dfn id="vhkj1"><fieldset id="vhkj1"><object id="vhkj1"></object></fieldset></dfn>

        ?

                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)

          •   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)

             

             


            同步練習(xí)冊答案