解题方法
1 . 已知函数
,
.
(1)当
时,求
的值域;
(2)若
的最小值为
,求k的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd27a38d8cf3d77fccc7011cd3dc0628.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1376168658dbe7f5b7f4d75fb1db545a.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b02f266bd253738e315e84231235f0d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
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2020-02-23更新
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5卷引用:辽宁省葫芦岛市协作校2019-2020学年高一上学期第二次考试数学试题