设函数
.
(1)当
时,证明:
;
(2)若关于
的方程
有且只有一个实根,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/962299beaac5f986d6b218846d81751e.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65397f11ea8af736f38debadf420c4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d35749a9bb8527be7838c0482fcd371.png)
(2)若关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9587df831df1af5e7dd6be5fdc7bd8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
2018·全国·一模 查看更多[1]
更新时间:2018-02-03 10:05:03
|
【知识点】 函数单调性、极值与最值的综合应用
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【推荐1】已知
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(2)若存在
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【推荐2】已知函数
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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(2)定义
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f08129c2be1150c812d499e5c104ce1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6252e443f22097fc949fa0540eb898d.png)
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(1)当
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(2)当
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