名校
1 . 已知函数
.
(1)当
时,求证:
在
上是增函数;
(2)若
在区间
上存在最小值,求
的取值范围;
(3)若
仅在两点处的切线的斜率为1,请直接写出
的取值范围.(结论不要求证明)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/491cc9e91e8b287c71b44f0facf88d51.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3ed15aa3dcc4211fb520b5b942c989.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/870ebc2f7aabb028024894568d749934.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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2024-02-04更新
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3卷引用:重庆市垫江第二中学2023-2024学年高二下学期第一次月考数学试题