1 . 已知函数
(
,
是自然对数的底数).
(1)设![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b74a01d149399210cc1ce429a5b2b20e.png)
(其中
是
的导数),求
的极小值;
(2)若对
,都有
成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbb342cd13839df8ae45e80b2c1073c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e69392d21261afd8e5e5f096634669.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/168b3e4b1d6f04226fa2687a72a268b4.png)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b74a01d149399210cc1ce429a5b2b20e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/724340d69477c0ec2418c392b22b1cab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/724340d69477c0ec2418c392b22b1cab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
(2)若对
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97148e04ca6a9f9dca0aba91ce4e1d84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f81ed7f6a4475e0fa682fa81ee747da3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
2019-02-01更新
|
1489次组卷
|
7卷引用:河北省衡水市衡水中学2019-2020学年高三上学期二调考试数学(文)试题
解题方法
2 . 已知函数
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b510c9a828d12bf880243fcd87a5a08.png)
A.![]() ![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
2022-11-15更新
|
381次组卷
|
2卷引用:河南省驻马店市第二高级中学2022-2023学年高三上学期第二次培优考试数学文科试题
解题方法
3 . 函数
的极小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd9ec2b7164f2fa40e66636f54821586.png)
A.![]() | B.1 | C.2 | D.e |
您最近一年使用:0次
名校
4 . 在①曲线
在
处的切线斜率为1;②
;③
有两个极值点
,这三个条件中任选一个补充在下面的问题(1)中,并加以解答.
已知
.
(1)若___________,求实数
的值并判断函数
的极值;
(2)试讨论函数
的单调性.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c9f8845aa2b51c460f2d798c9f62fa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cedde86fd5b5e93c14ffd9190fc7d7a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d02d9f149c12ef612345a0617650215e.png)
已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efda0285dfa16947972f4c8fb8bd9f88.png)
(1)若___________,求实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)试讨论函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
您最近一年使用:0次
解题方法
5 . 已知函数
,
.
(1)求函数
的极大值;
(2)求证:
;
(3)对于函数
与
定义域上的任意实数
,若存在常数
,
,使得
和
都成立,则称直线
为函数
与
的“分界线”.设函数
,试探究函数
与
是否存在“分界线”?若存在,请加以证明,并求出
,
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd47380305102e11cc930e008d25c75b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66d5bccea7ccd7a3c854c6fb4cb5ca75.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43876a5fdbcac476e7eed5a24434a484.png)
(3)对于函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb7df298a9364b36e079a61caec815c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a48d51c7e8a1f5cf3349e07a8ac4f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745408b6bd3b6feab62095c84b81a33d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15fb18163df0690365a0d2e7ee88f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb7df298a9364b36e079a61caec815c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e88bd707d897ad723c5bf4809f278cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb7df298a9364b36e079a61caec815c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
您最近一年使用:0次
6 . 对于函数
可以采用下列方法求导数:由
可得
,两边求导可得
,故
.根据这一方法,可得函数
的极小值为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83dc5472ac3eeab07d0b829dbc54199e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f46d3504fd4d99c1a9a293a9363256ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fc032cda1dedf229d7df873c2e9ca27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6511a56a6d6cfbd027e66ad5fe499442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2209e51f22292a1ac063057f4ccf91b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7177e892d4fdc56325743b2f882b0f38.png)
您最近一年使用:0次
2021-03-25更新
|
527次组卷
|
2卷引用:全国百强名校“领军考试”2020-2021学年高二下学期3月联考数学(理科)试题
7 . 已知函数
.
(1)当
时,求
的极值;
(2)当
时,讨论
的零点个数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebb3353d8a9e482ae29ef8e785a59512.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd876a2ed79c64bacc3e64b8ee92735e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6c8951e515ff33eb8292e769d146885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
您最近一年使用:0次
8 . 已知函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c01ca96ecbffa2f6da20be15b00a83ba.png)
.
(1)求函数
的极小值;
(2)求证:当
时,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c01ca96ecbffa2f6da20be15b00a83ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5c579ca8913267856a1a4b0817efd0.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)求证:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b89c33bf8803c80b65d4ebd7746645e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05fce924911d5ed93147dfce9e41c2b0.png)
您最近一年使用:0次
2019-04-14更新
|
1008次组卷
|
5卷引用:2020届全国100所名校高考模拟金典卷理科数学(四)试题
22-23高三上·全国·阶段练习
解题方法
9 . 已知函数
的导函数
,若
在
处取到极小值,则
的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ccc2bbbf0499eb324a49f36f2da15bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36d71f015144ffaf1faec94a259b4a06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
解题方法
10 . 已知函数
.
(1)若函数
,求
的极值;
(2)证明:不等式
恒成立.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e931919cef78c2c21aba1822ce6e66ea.png)
(1)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f5be3af0c67a20bee47063487d305f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
(2)证明:不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3ca6f83c8f9d8521fc554800f62a992.png)
您最近一年使用:0次