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)
您最近一年使用:0次
2016-12-04更新
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303次组卷
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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
2 . 对于函数
,有以下说法:
①
是
的极值点.
②当
时,
在
上是减函数.
③
的图像与
处的切线必相交于另一点.
④若
且
则
有最小值是
.
其中说法正确的序号是___________ .
![](https://img.xkw.com/dksih/QBM/2016/6/21/1572762882621440/1572762888486912/STEM/33ab23d219d64985b3f090fbf9797e6b.png?resizew=119)
①
![](https://img.xkw.com/dksih/QBM/2016/6/21/1572762882621440/1572762888486912/STEM/c9281957ea904b929eb91374f4ca1f08.png?resizew=37)
![](https://img.xkw.com/dksih/QBM/2016/6/21/1572762882621440/1572762888486912/STEM/969ab8d305cb4c949e48cc879a168f91.png?resizew=36)
②当
![](https://img.xkw.com/dksih/QBM/2016/6/21/1572762882621440/1572762888486912/STEM/fdbfe123468c46bf86a7e77c65d6c031.png?resizew=38)
![](https://img.xkw.com/dksih/QBM/2016/6/21/1572762882621440/1572762888486912/STEM/969ab8d305cb4c949e48cc879a168f91.png?resizew=36)
![](https://img.xkw.com/dksih/QBM/2016/6/21/1572762882621440/1572762888486912/STEM/7f01a2627465485a9ce80a309b40cc25.png?resizew=72)
③
![](https://img.xkw.com/dksih/QBM/2016/6/21/1572762882621440/1572762888486912/STEM/969ab8d305cb4c949e48cc879a168f91.png?resizew=36)
![](https://img.xkw.com/dksih/QBM/2016/6/21/1572762882621440/1572762888486912/STEM/44b52e3ec1a94026b516d65b6c61b48a.png?resizew=60)
④若
![](https://img.xkw.com/dksih/QBM/2016/6/21/1572762882621440/1572762888486912/STEM/277c90876f6145778e6cd80894d4641e.png?resizew=39)
![](https://img.xkw.com/dksih/QBM/2016/6/21/1572762882621440/1572762888486912/STEM/39bd0aaa91204a979dab842d83cc9bac.png?resizew=39)
![](https://img.xkw.com/dksih/QBM/2016/6/21/1572762882621440/1572762888486912/STEM/2a606d1342454855ae47c22f0ade4a7b.png?resizew=83)
![](https://img.xkw.com/dksih/QBM/2016/6/21/1572762882621440/1572762888486912/STEM/da8a43d029b743e3b0f724720788dce3.png?resizew=21)
其中说法正确的序号是
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