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1 . 选修4-5:不等式选讲
已知函数
,
.
(1)当
时,解不等式
;
(2)当
时,
恒成立,求
的取值范围.
已知函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/743570a5e44dcea6a7a04e7796fda136.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10bbdef421c976962a270a2beabbad91.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65397f11ea8af736f38debadf420c4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4509817be39bef4bcde115996ee39e8.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ada1ccce7a29845fe2f77cf916f9f5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0a62f9785ee9772a4baabc362200f85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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2016-12-04更新
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名校
2 . 已知函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf4f64534a7a220fcac4f7f931a0baee.png)
(Ⅰ)已知常数
解关于
的不等式
;
(Ⅱ)若函数
的图象恒在函数
图象的上方,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf4f64534a7a220fcac4f7f931a0baee.png)
(Ⅰ)已知常数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55ef01e8878bb8939c5657025ec55294.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/966b7829c0ec4d2abe0973e3b560e369.png)
(Ⅱ)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b6894e8c345a035e89ec672503a01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93e03ad0c315806342d6cd732a0b91a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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3 . 已知函数
.
(1)解不等式
的解集
;
(2)记(1)中集合
中元素最小值为
,若
、
,且
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cadf198fe8fd8f41ff8f5c8697c854dd.png)
(1)解不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2a8a9f4f0d6590de86becb733bd1b6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(2)记(1)中集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1dc3a46b526d487b8bea35b4ba75b01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab04de6651256f6281e9f4c1dc3c7955.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7062437458faee13d1938f99b8543c59.png)
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2017-09-02更新
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