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1 . 关于
的函数
,我们曾在必修一中学习过“二分法”求其零点近似值.现结合导函数,介绍另一种求零点近似值的方法——“牛顿切线法”.
(1)证明:
有唯一零点
,且
;
(2)现在,我们任取
(1,a)开始,实施如下步骤:
在
处作曲线
的切线,交
轴于点
;
在
处作曲线
的切线,交
轴于点
;
……
在
处作曲线
的切线,交
轴于点
;
可以得到一个数列
,它的各项都是
不同程度的零点近似值.
(i)设
,求
的解析式(用
表示
);
(ii)证明:当
,总有
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca3904b79fdb74189b8b9933fdb6b341.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/beecc7a1e5d079e0bcde356848626436.png)
(2)现在,我们任取
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd8f08fa7920ab3d6b3ec6c831a43fe3.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d27c0ab3e2d7698f082854bafe4174dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb652143b43cc9439a347b2b1dc5cf6.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cc47735cc385a3474bc1dabad322304.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/367304824e7eb354ffeb937fa209d80d.png)
……
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/641fec779880f75fa8ee6782f3350402.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddbac61ee33f7cbd19ffe10582e8f1f6.png)
可以得到一个数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e976c0663fa749ca749f99842d21ca03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(i)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76c0a98e6d574ec3702340e64bba6c0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/091f2176a35c27ac4bdddcda85de5bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3282e5fde4ae53fcb1bb072a685304c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19ee4b6d8f24ec689324efbf66a52e80.png)
(ii)证明:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/449f1600850683d2ac445d97e7a3b5cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09a415b86943618bf0c8ebc5951a1aef.png)
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名校
2 . 已知函数
,g
.
(1)求
在点
处的切线方程;
(2)讨论
的单调性;
(3)当
时,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6f8301273e322867a8a70afbd6ecb54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb14416005b98c9017884b53c07b12bb.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7a999c36de5c9a9ce876a4a56fa34c.png)
(2)讨论
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3829d4ac31608ee00d6f09994fad3b1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7906c86b5445f1e96ae83294d2e2b53f.png)
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2022-02-15更新
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5卷引用:重庆市第八中学2017届高三适应性月考卷(八)文科数学试卷
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3 . 已知函数
.
(1)求曲线
在点
处的切线方程;
(2)证明:
存在唯一极大值点
,且
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2b879ffedf529bd008db02045d14db8.png)
(1)求曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bea9227dd0104da58e0c40952cc87ed.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4cfb2d80ec27db79ffad4b4b9f5994c.png)
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4 . 已知
(e为自然对数的底数,
).
(1)对任意
,证明:
的图象在点
处的切线始终过定点;
(2)若
恒成立,求实数a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba9d561b74386542d58348881ecd87a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca1d281244b6d8a42fcebf05622eb21a.png)
(1)对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10bbdef421c976962a270a2beabbad91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bea9227dd0104da58e0c40952cc87ed.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b4955c5adc717b7f6f0b975e0724ff5.png)
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解题方法
5 . 已知函数
,曲线
在点
处的切线方程为
.
(1)求
,
的值;
(2)若
,
是两个正数,且
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4607fb4254cc73fee843fca8eaad6da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5828873f8369183faf71181cda5b61d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1e84049095dad63146c5f2585af7a7a.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3b39affb2d668596c7f5e2ff310cc24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c701c5c07f7c584aadd218d9e341d3ac.png)
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6 . 已知函数
(其中a,b为实数)的图象在点
处的切线方程为
.
(1)求实数a,b的值;
(2)证明:方程
有且只有一个实根.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3acc71edbd2abb34f5faf9a286cdcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68c6b6a11760d0724b0b60e55970e229.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f5191798242b7b9b88a75e17e4425.png)
(1)求实数a,b的值;
(2)证明:方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39200f8d4e67df26ffa62a90cecdd6a0.png)
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7 . 设曲线
在点(1,0)处的切线方程为
.
(1)求a,b的值;
(2)求证:
;
(3)当
,求a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9faf69566f751cda267c413176b8eebc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baabfd32465e9e50409413d9c1358279.png)
(1)求a,b的值;
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ee2512d8089189dac72648ea12b23b9.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e14fbb91b713789ec66375749bf0952a.png)
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8 . 已知函数
,
.
(1)已知直线
与函数
相切于点
,且直线
的斜率为
,求直线
的方程及
的值;
(2)当
时,记
的最小值为
,求证:存在
,使得
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d9f144dce2affb0ba0647506d04a611.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e69392d21261afd8e5e5f096634669.png)
(1)已知直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee73294987312155754dd9f6c007dba6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31da7291140e430a11e2a10cc6cdefbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e10e1c43b86a8cd4360ca9b57232164.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52a7b7c834d06f3e28a339db94690172.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72819ecc9ba5564bbe86e1e20605946a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc687f8ce16ed911a417ad0077845cb5.png)
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名校
9 . 已知
,
.
(1)求
过点
的切线方程;
(2)正实数a,b满足
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/603589540f7897790f99a8d75fd725f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/867a7e3440245ecbef23092781581248.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b2c84e7b41a841a230ed5f8a42309aa.png)
(2)正实数a,b满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a914b6c6591f067aeaa7a2090db3fda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9707dcd2a38e5cb5fe8222ccacb3e09.png)
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名校
解题方法
10 . 已知函数
.
(Ⅰ)求函数
在
处的切线方程;
(Ⅱ)若关于x的不等式
恒成立,求实数a的值;
(Ⅲ)设函数
,在(2)的条件下,证明:
存在唯一的极小值点
,且
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d3b341e8d416d62621f154d7fb3a32e.png)
(Ⅰ)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
(Ⅱ)若关于x的不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b4955c5adc717b7f6f0b975e0724ff5.png)
(Ⅲ)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bca4be345087f993a4078e16c16608e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb7df298a9364b36e079a61caec815c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f09c7c336fb0fcc0abc3d1da4da8c9ec.png)
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