名校
解题方法
1 . 已知函数
,
.
(1)若
,写出函数
在
上的单调区间,并求
在
内的最小值;
(2)设关于对
的不等式
的解集为
,且
,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18672eb4df921b380f518b72a5912f1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcd9218a657b17654c5d757a6f7dee9a.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aed39f5aca78934fb383402433fe549.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d188ec2580e273ce87e51653a2177ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d188ec2580e273ce87e51653a2177ee.png)
(2)设关于对
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e3b8f5edf3e30465035ea5b2eedee2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45242b802854eb7fc3ed681c4acdbf58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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名校
2 . 已知函数
,函数
,函数
.
(1)求不等式
的解集;
(2)若存在
,使得
成立,求实数a的取值范围;
(3)定义在I上的函数
,如果满足:对任意
,存在常数
,都有
成立,则称函数
是I上的有界函数,其中M称为函数
在I的上界.讨论函数
在
上是否存在上界?若存在,求出M的取值范围;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/560d40592d78b0c23a7cd28f167a0165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f884d3de1ee2523d73cf25fca011926.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/650c512b3b170ace9298b353f4b6b837.png)
(1)求不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c31b687247b7ca16a7813e3881d18a52.png)
(2)若存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d177e81376f2f7334f7efd8451d273e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e63bbadc6250f7139836ede33205550.png)
(3)定义在I上的函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61c388166862b3ccfcc7ca749ebe5949.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bb6324279df94decba955e04ccfa9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2480f87a11c4cd450bc9454ea7276722.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0be561d619ae9c0d151ee3b7f0fe8222.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61c388166862b3ccfcc7ca749ebe5949.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61c388166862b3ccfcc7ca749ebe5949.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb7df298a9364b36e079a61caec815c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c7b69e93488fcd2a195cb9793e94fc7.png)
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