已知函数
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb1e3537cac5767bb48a12cfd09fe4f9.png)
(1)证明:当
时,
;
(2)
时,设
,讨论
零点的个数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0788f3882e153c426a57814f44ce9a48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb1e3537cac5767bb48a12cfd09fe4f9.png)
(1)证明:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/447d6f62c09c1d05346fd16a24159f6e.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cffa662f0273f0921c1fa4727f632395.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a813b5adbf5c7082561237894ba6d599.png)
22-23高三上·安徽芜湖·期末 查看更多[4]
安徽省芜湖市2022-2023学年高三上学期期末数学试题(已下线)第五章 一元函数的导数及其应用 讲核心 03安徽省名校联盟2023届高三下学期开学模拟考试数学试题(已下线)导数专题:利用导数研究函数零点的4种常见考法-【题型分类归纳】2022-2023学年高二数学同步讲与练(人教A版2019选择性必修第二册)
更新时间:2023-01-13 23:19:52
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解题方法
【推荐1】已知函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eddb82b1e7ff9cc5a46b9e8bd6b314ba.png)
(1)若
在
上单调递增,求实数a的取值范围.
(2)若
,求证:当
时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eddb82b1e7ff9cc5a46b9e8bd6b314ba.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3c60697baa24e57e841532e79462e31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe86cace140f2c3588ab115837bbfc9e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64fa43437a86b5fdcc1dd9b73617ab31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e2e79843faf62dde86bf858d1e0569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3417699eb4a32521b7ff1f7b2a1d5f47.png)
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【推荐2】已知函数
.
(1)当
时,讨论函数
的单调性;
(2)若正数m,n满足
,求证
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a6ec75004d976d93ae4350db3faafe9.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e10e1c43b86a8cd4360ca9b57232164.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若正数m,n满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72c1df01f378e3cf5e6b35bc8019eb4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f6c546f98a5975e7328640cdd5b5a7e.png)
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【推荐1】已知函数
.
(Ⅰ)若
,求函数
的最大值;
(Ⅱ)若函数
恰有两个不同的零点,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90c5db2d112036bc7a19129609083fe.png)
(Ⅰ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b6894e8c345a035e89ec672503a01f.png)
(Ⅱ)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b6894e8c345a035e89ec672503a01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐2】已知函数
,
,
为
的导数.
(1)求证:
在区间
上存在唯一零点;(其中,
为
的导数)
(2)若不等式
在
上恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0651c34962c192c403be88f37218b92b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/585de67a3fc494297d375d339af6d153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4b04824a308519a61318a82aa97a05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51350a90203fcdc2d500a89061b7f52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/304226ca50149b49702928e44d565964.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51350a90203fcdc2d500a89061b7f52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
(2)若不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83f353c8b6cf874a59e5a05ab4726fdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeb49dbba01c4ff5f686ffc8828351b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐3】已知函数
,其中常数
.
(1)求
的单调区间;
(2)如果函数
没有零点,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bd037cec87ff3f7cefcde02a9411a7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)如果函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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