名校
解题方法
1 . 已知函数
,其中
,
.
(1)当
时,
的零点为______ ;(将结果直接填写在横线上)
(2)当
时,如果存在
,使得
,试求
的取值范围;
(3)如果对于任意
,都有
成立,试求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55b169c3fef0685cc75cfe9e52285c81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e69392d21261afd8e5e5f096634669.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d285a4c557fc9748105b62ccd94b7859.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48adb8a59b5c02fad5eada1b35171cf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25e8d7d9c43b12ef51f366217af2d5b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/799b324b514d6044672c133d8fef2dc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/133cb4bfa780967fce1ef6181f2cf545.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)如果对于任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d81410c357d67b72895494ee50ce592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e38c541dec8fce1d26886e5ef7d21f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d6fc9b90f370fbb27552876b650f8f.png)
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