已知函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edf4bc025a29adc7bfdb6818ee8b9e3d.png)
(1)若
恒成立,求a的取值范围;
(2)若
的最小值为
,求a的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edf4bc025a29adc7bfdb6818ee8b9e3d.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dc9ede2e55724383dd1093fc7fcdb59.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29418e5014731850c55565b6bf47aa41.png)
更新时间:2019-02-17 21:16:55
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【知识点】 与二次函数相关的复合函数问题
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解答题-问答题
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较难
(0.4)
【推荐1】已知函数
,其中
,
(1)当
时,把函数
写成分段函数的形式;
(2)当
时,求
在区间[1,3]上的最值;
(3)设
,函数
在(m,n)上既有最大值又有最小值,请分别求出m,n的取值范围
(用
表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d55139655bcf43ff8e48c1e188b1ac3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e69392d21261afd8e5e5f096634669.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
名校
【推荐2】已知函数关于
的函数
.
(1)当
,求
的值域;
(2)若不等式
对
恒成立,求实数
的取值范围;
(3)若函数
有3个不同的零点,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec5748527c15e370dcf4230ad2d0e1b5.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69303621c56f67b4ec4e0ac575deb554.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)若不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f49365ab5095e276cb100896cbb52b03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd2f642e9e5d3095238c9d597c1b1003.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
您最近一年使用:0次