已知
,函数
,
.
(1)证明:函数
,
都恰有一个零点;
(2)设函数
的零点为
,
的零点为
,证明
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ef8417c70282f1fa4e2f8c9d56e558e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41a27a1e3bfdcfd4d0508c220e99a3c3.png)
(1)证明:函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
(2)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2500334c81bf009e1efae516b56ffced.png)
22-23高三上·广东深圳·阶段练习 查看更多[4]
广东省深圳市部分学校2023届高三上学期9月大联考数学试题广东省茂名市2023届高三上学期9月大联考数学试题湖南省长沙市周南中学2023-2024学年高三上学期入学考试数学试题(已下线)重难点突破09 函数零点问题的综合应用(八大题型)
更新时间:2022-09-29 13:51:38
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【知识点】 利用导数研究函数的零点
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解答题-证明题
|
适中
(0.65)
【推荐1】已知函数
,
是自然对数的底数,
,
.
(1)求
的单调区间;
(2)记
:
有两个零点;
:
.求证:
是
的充要条件.要求:先证充分性,再证必要性.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/656ed69a6c78d2b66f47d08f5913796d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/041a7c8fc017f596542c5e6ec7d1c40b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8166e75ef9ebda44ee6c4f23209acca3.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c81d60b0525a338954e9a4fde52aa643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
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解答题-问答题
|
适中
(0.65)
【推荐2】已知函数
的图像过点(0,-2),且在该点的切线方程为
.
(Ⅰ)若
在[2,+
上为单调增函数,求实数a的取值范围;
(Ⅱ)若函数
恰好有一个零点,求实数m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2bce41cd8e7cd722b314c1c624098ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5d219b9829ed2ef9211dc74f516dc70.png)
(Ⅰ)若
![](https://img.xkw.com/dksih/QBM/2012/3/1/1570784933740544/1570784938942464/STEM/73c14d34b5be4a0ca1d803b06ad5b49c.png?resizew=36)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15494a67b544dd86d11c43bb81f3ba73.png)
(Ⅱ)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f95c704d04501b03ad6f4e9d75d384f.png)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
【推荐3】已知函数
,它的导函数为
.
(1)当
时,求
的零点;
(2)若函数
存在极值点,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ebd7a38e057765b2afeb62aa16c7523.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4b04824a308519a61318a82aa97a05.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4b04824a308519a61318a82aa97a05.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次