已知函数
.
(Ⅰ)当
时,
恒成立,求实数
的取值范围;
(Ⅱ)若函数
,且函数
在区间
上是增函数,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b0fb0ed765325b27c405d8071cc9d38.png)
(Ⅰ)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/200f24e682c93e02a87f3f9d57dc5d40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/114c0d795f3389e4d292a4e8f0edbccc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(Ⅱ)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36ff308ff14f24b801ab1e00e892fc0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee32e6f86a047611765b7a26ba5e4af8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7242b2ab643f9470da77e29d043b893.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
更新时间:2020-02-23 17:18:46
|
【知识点】 对数函数最值与不等式的综合问题
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐1】对于定义在区间
上的两个函数
和
,如果对任意的
,均有不等式
成立,则称函数
与
在
上是“友好”的,否则称为“不友好”的.
(1)若
,
,则
与
在区间
上是否“友好”;
(2)现在有两个函数
与
,给定区间
.
①若
与
在区间
上都有意义,求
的取值范围;
②讨论函数
与
与在区间
上是否“友好”.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbd8466b576ad34d6ef492599940f4b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23fb90e09994fdc6ab02ed6ba664f31f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b593315a098b5310825524dd1834af9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc43e80f74233a226ee4be0da36f566c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ca158b11ff270aaa25b3e7a2cbd8e56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23fb90e09994fdc6ab02ed6ba664f31f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b593315a098b5310825524dd1834af9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7da2bd445988f2649ac453bd4eff5fa2.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e96bc6f6b7038abd491e38312daa2ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2477a9211001569dccb3cd9f192fdc71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23fb90e09994fdc6ab02ed6ba664f31f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b593315a098b5310825524dd1834af9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8004d42bd7116586301f92ba77bb3cde.png)
(2)现在有两个函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0470b33d96ba3f63539fad13000a6688.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19abb56d8cb4f6192ed4a3ee2db3afe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7bf9161a241929e71172182c07ae31b.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23fb90e09994fdc6ab02ed6ba664f31f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b593315a098b5310825524dd1834af9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7bf9161a241929e71172182c07ae31b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
②讨论函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23fb90e09994fdc6ab02ed6ba664f31f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b593315a098b5310825524dd1834af9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7bf9161a241929e71172182c07ae31b.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
解题方法
【推荐2】已知函数
为偶函数.
(1)求
的值;
(2)已知函数
,若对任意
,存在
,使方程
成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f6ead3b49bd4e5aba61a27d44f96d70.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)已知函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f2c97d323d230aff5e271708c595bdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9bc8f11fd77a832e2f16e0387523c4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0db7eb2d7545d055f1cb6e8a7b5e1dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52401ea325a01816e3df20d2d867736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次