已知 函数
,
,若
且对任意实数
均有
成立.
(1)求
表达式;
(2)当
时,
是单调函数,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c8af0af293972b905caa5812b742cb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffc1d598fc0243c79bb6a6ef1ed93b12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a431537df789febf4bc45e3dc23cefaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e9c599e8d420006448905acec2b8234.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24aa16b780156e18f12baa2b8ee0f9a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27ce93b9f0ea8d7e3a5e4a4f2fcacf45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
更新时间:2018-03-28 22:59:49
|
【知识点】 由函数在区间上的单调性求参数
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解答题-问答题
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(0.4)
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解题方法
【推荐1】已知函数
.
(1)若函数f(x)在定义域上单调的,求实数a的取值范围;
(2)若函数f(x)存在极值,且这些极值的和大于
,求实数a的取值范围
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afa3618d8cff21fe70caef80570270db.png)
(1)若函数f(x)在定义域上单调的,求实数a的取值范围;
(2)若函数f(x)存在极值,且这些极值的和大于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60654c7c7f5fbf6cdab76692158ab6b1.png)
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解答题-证明题
|
较难
(0.4)
名校
【推荐2】已知函数
在点
处的切线与直线
平行.
(1)求
的值;
(2)若函数
在区间
上不单调,求实数
的取值范围;
(3)求证:对任意
时,
恒成立.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a61082b7e56bb497b4fa348427024dcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/606e5694c2f33033cced4e29d3152c16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70bade5e774c30e5ab9b601a8031377d.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987ee644169ad93379283ae715d8ebf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)求证:对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10874bc06b7d4d050d11b49127f4208b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6023e8dbbcc4b8ea21efb56c4ff2450b.png)
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解答题-问答题
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较难
(0.4)
【推荐3】已知函数
,其中
,e是自然对数的底数.
(1)若
单调递增,求a的取值范围;
(2)若
,判断函数
的零点个数.
(参考数据:ln2≈0.693,e≈2.718)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4938bceacac5e4d3d36dc7be37ecb39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10bbdef421c976962a270a2beabbad91.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/effd486acb416eb05e02a19727227bae.png)
(参考数据:ln2≈0.693,e≈2.718)
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