已知函数
.
(1)当
时,求函数
在
上的最大值;
(2)令
,若
在区间
上为单调递增函数,求
的取值范围;
(3)当
时,函数
的图象与
轴交于两点
,且
,又
是
的导函数.若正常数
满足条件
.证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8069113f5f6c47e4d72f2a3890af7d7e.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7fefece0cf6660a409832f72dff95.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60b9ff3088cf75d2c0723095b849155a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a1cfb60420ff7e72c1b9d64f69ae063.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed18bd80c6c4142f68e89f4ad44570b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6caaa5229151d3101a125c2cb82d7424.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b4a57fa701747e4b70ce26eb18ab8cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d41acc47493556617fe7b9e55093d10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa4516485edd9fa7a96ce7c3694624ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a813b5adbf5c7082561237894ba6d599.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfa404d3ff313b0a28a76a48d7d87234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8e1c19b1ccb1ababd42f72e9fead0a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12ea91586599a572adb9e7c3e86b5415.png)
更新时间:2016-12-02 21:47:53
|
【知识点】 利用导数研究函数的单调性
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