解题方法
1 . 已知函数
.
(1)若函数
在
上单调递增,求
的取值范围.
(2)若函数
的两个零点分别是
,且
,证明:
①
随着
的增大而减小;
②
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/554604e4c3bb9fe9e186a43d3e0d5575.png)
(1)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d562dc22dfb3b81d0c3f88b54d063c2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce7ae90d808f05e86ea063238e4b2f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26d8dafc71b106f39f4e15442220897b.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be4c51e13a3011722c8340321ad5a7a5.png)
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名校
2 . 已知函数
,
且
.
(1)讨论
的单调性;
(2)比较
与
的大小,并说明理由;
(3)当
时,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db741e3711e2f6d20b1390ed5739756b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45ba6b6aa6c3f9faba6b03bc193a6e61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e2015b8dd73e9ab0eae4a13dd591d32.png)
(1)讨论
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)比较
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/935188093070b35d49e16e585ea02d0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/275ee9b02024a78617f0149d4bf6fcda.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f093c61867ee4ce75f951d46b9b123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3342f3b90cb012d45ece926c8a7ea202.png)
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名校
3 . 已知函数
.
(1)若
,讨论
的零点个数;
(2)若
是函数
(
为
的导函数)的两个不同的零点,且
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a441ed40dca1a0f8c5ed0253d1ca300.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ab42358409a44ea7a55fe532fe66ce5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce7ae90d808f05e86ea063238e4b2f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b550cb121a3346f8d46b7f7ee2117d5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380beb181ed0a48cc486131bba4a4c46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26d8dafc71b106f39f4e15442220897b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d106beb9c7a567f35e7f3407f41c963c.png)
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解题方法
4 . 已知函数
没有极值点,则
的最大值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de066d4f044a07c8de46eef5a5a95206.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8e969be87b3752a1203f4e321911d1d.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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5 . 定义:若函数
图象上恰好存在相异的两点
,
满足曲线
在
和
处的切线重合,则称
,
为曲线
的“双重切点”,直线
为曲线
的“双重切线”.
(1)直线
是否为曲线
的“双重切线”,请说明理由;
(2)已知函数
求曲线
的“双重切线”的方程;
(3)已知函数
,直线
为曲线
的“双重切线”,记直线
的斜率所有可能的取值为
,
,…,
,若
(
),证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
(1)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08b9f0b9e53a83e68f5fec944f343119.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc8a553c84daabf4712f90ab9ee94bef.png)
(2)已知函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d7516bcbeb8f495ba0b733fa96b58d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1938c093dd2fbcb752d0eb7a18d143b2.png)
(3)已知函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1da9aa9c7764d416d2b01f78d3e13ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f786a5701dc1a8a015e8843c3360151b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bbbf4d763f3cbe5a71707bc19c78191.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d5e994ba0a62aef45fa52021ce7d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d8658c1a671eed5cad065d39a8a13c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a097fa8e3bfa45de1ea35f1ad907fe3.png)
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6 . 已知函数
,
,
.
(1)判断
是否对
恒成立,并给出理由;
(2)证明:
①当
时,
;
②当
,
时,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ea987f231a61367682b6abb1d490860.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c7743ab916fb33ca0d2fc597cfc672f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac4cbc7b067862a3d9c6789b392fc068.png)
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e653994b245fbdc2ac3458429c65e69e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3add1679c27392a1a7f635723a4b36eb.png)
(2)证明:
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d005e2d92072f3ed9289c5bb80f55cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a5494b7905201c6f627c12b85b8a369.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1c8b04a43f618f95b4ad5474944a64c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecd436cb785ccb4d29baa6bf70c10a09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6495c0fcf9672516f5cb8c5ef614df13.png)
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|
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名校
7 . 已知函数
.
(1)若
,求证:
;
(2)讨论关于x的方程
在
上的根的情况.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43dea74af12e4b8564bf08c74f8a37c0.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc895959e9bc92294dc9dd2263dbf0c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dc9ede2e55724383dd1093fc7fcdb59.png)
(2)讨论关于x的方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11a910ceddf453ba57ee7fa09652f1ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27cf818dd484cc4cebd40a5f28eb8e9f.png)
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8 . 已知曲线
在点
处的切线与曲线
相切于点
,则下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b743bb6d5af217588221654a31dbc432.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8198c3b302b3820e86763428eb1e91cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31109bde2b310c87e3e7992304765b85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3463ced6030af957f13f9ba05b977c1c.png)
A.函数![]() |
B.函数![]() ![]() |
C.![]() |
D.![]() |
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名校
9 . 已知函数
.
(1)当
时,求曲线
在点
处的切线方程;
(2)当
时,若
分别为
的极大值点和极小值点,且
,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/682f847b99736449dbed71d1b2925f0a.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/068ff25c767fcbe6fe596d996031eed1.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/882b660047bb6ded500cedba57958e00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce7ae90d808f05e86ea063238e4b2f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaeb1e529e152749236dbc8d9385f143.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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解题方法
10 . (1)求函数的极值;
(2)若,证明:当
时,
.
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