1 . 已知函数
,其中
.
(1)当
时,求函数
在点
上的切线方程.(其中e为自然对数的底数)
(2)已知关于x的方程
有两个不相等的正实根
,
,且
.
(ⅰ)求实数a的取值范围;
(ⅱ)设k为大于1的常数,当a变化时,若
有最小值
,求k的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8af8167e6d701adfd8ecc0479f08cc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22dd8b3dc4c609bab82d356a5cc2208d.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea59cee971344ed593ff082a65d177c2.png)
(2)已知关于x的方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1494a57974d201cdd9767b53e80b92a.png)
![](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/26d8dafc71b106f39f4e15442220897b.png)
(ⅰ)求实数a的取值范围;
(ⅱ)设k为大于1的常数,当a变化时,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea22b102beff309162c82f4f32e7ec58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2acc2da5f81c9a6db4620fa9cb0fadf4.png)
您最近一年使用:0次
2023-05-18更新
|
1068次组卷
|
3卷引用:天津市北辰区2023届高三三模数学试题
解题方法
2 . 已知
,其中
为自然对数的底数.
(1)当
时,求函数
在点
处的切线的方程;
(2)当
时,求函数
在
上的最小值;
(3)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd3cf77742884004ae48295670861b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/168b3e4b1d6f04226fa2687a72a268b4.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ea9824af71c9da5db5a00ec06063024.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/200f24e682c93e02a87f3f9d57dc5d40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7889b949ce40aa4cefae07c477b527d3.png)
(3)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62baf0055dd4d2a3149f36fdef129781.png)
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