1 . 已知函数
,
.
(1)当
时,讨论
的单调性;
(2)设m,n为正数,且当
时,
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e7f1b41968ad672670286194f64a2b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb09b7c2d859a7839698a88c8c4d8340.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89e455f4e6c97270bd28f207b89df5fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)设m,n为正数,且当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47e2302295333e96f24e328bc4e1f9dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52ae9a64df7227e75d10277a57e3d88e.png)
您最近一年使用:0次
2022-07-08更新
|
672次组卷
|
5卷引用:吉林省四平市第三高级中学2022-2023学年高二下学期6月月考数学试题
解题方法
2 . 设函数
,若对任意
,都有
(
)恒成立.
(1)求
的取值范围;
(2)求证:对任意
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e96546b3259afe4add331673fb835c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2fb40a36a293471742ce75f6b9635b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9e004d412add713770bdc614d78987e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)求证:对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2fb40a36a293471742ce75f6b9635b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc8fa15a0908636fe434e53be0a6bedf.png)
您最近一年使用:0次