已知函数
.
(1)当
时,求函数
的极值;
(2)若函数
没有零点,求实数
的取值范围.
![](https://img.xkw.com/dksih/QBM/2015/3/31/1572053551022080/1572053557108736/STEM/d93e094289bb4274bc489cd760eeb4a4.png)
(1)当
![](https://img.xkw.com/dksih/QBM/2015/3/31/1572053551022080/1572053557108736/STEM/157531f9227344f3997ebd38252f80a8.png)
![](https://img.xkw.com/dksih/QBM/2015/3/31/1572053551022080/1572053557108736/STEM/9432f2244fbf4f1a80ea2cb703804f1b.png)
(2)若函数
![](https://img.xkw.com/dksih/QBM/2015/3/31/1572053551022080/1572053557108736/STEM/23314ef6b5034c0d9351a1c342f6bff9.png)
![](https://img.xkw.com/dksih/QBM/2015/3/31/1572053551022080/1572053557108736/STEM/924c900ff9ae463fa7baf6b96fa39a67.png)
更新时间:2016-12-03 11:34:03
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【知识点】 导数在函数中的其他应用
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