解题方法
1 . 设函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2eb218179dc239e58148a2524bb8f57.png)
(1)当
时,若
是函数
的极值点,求证:
;
(2)(i)求证:当
时,
;
(ii)若不等式
对任意
恒成立,求实数
的取值范围.
注:e=2.71828...为自然对数的底数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2eb218179dc239e58148a2524bb8f57.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b108ab31cc093f03cf48ad65429889e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7e275e8e2dc8cf4044871ad459d8ecb.png)
(2)(i)求证:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e2e79843faf62dde86bf858d1e0569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e202d64aab2e5e0023ad00c85af6d2.png)
(ii)若不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/776304b31f9890be3d2313e7fd68dd9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e2e79843faf62dde86bf858d1e0569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
注:e=2.71828...为自然对数的底数.
您最近一年使用:0次
2 . 设
.
(1)若直线
与和
和
图象均相切,求直线
的方程;
(2)是否存在
使得
按某种顺序组成等差数列?若存在,这样的
有几个?若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/550e9fd0afb51923f72b65ce72bbe419.png)
(1)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a1cfb60420ff7e72c1b9d64f69ae063.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(2)是否存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbbb0751d3fe0d2a6cc024a62e9f7825.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d34ea801c04c749794ee2e15c3110c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
您最近一年使用:0次