1 . 选修4-5:不等式选讲
已知
,且
.
(1)求证:
;
(2)若
,使得对一切实数
不等式
恒成立,求
的取值范围.
已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c0e9d1ad9561d693958756ee8398218.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/078ad813c9d3f4f17d6b2897d560fa54.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df87e67af966314c463f495bd6963068.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1485a4756c56f1126b9825d5019d544c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a26b9715d3a87f0634ce13af38b3135c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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2卷引用:2017届贵州遵义市南白中学高三第一次联考数学(文)试卷