2012·河北衡水·一模
名校
解题方法
1 . 设
,
.
(Ⅰ)当
时,求曲线
在
处的切线的方程;
(Ⅱ)如果存在
,使得
成立,求满足上述条件的最大整数
;
(Ⅲ)如果对任意的
,都有
成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0308bf45d7893b66fd25e322835cb4d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98c699778c1f92e2d975ac67c104d3fe.png)
(Ⅰ)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/9b384412acba251d87902ab928902f16.png)
(Ⅱ)如果存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9331df9c46ceb8f74f4cd7535e4b30d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30f6fbb6f8133c81b5a61b91ad796df5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(Ⅲ)如果对任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa9f0a52d1106a0c30d08ba59599094a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdf80f9cf72a90e6a974a9b634f06887.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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