函数
满足
,若
恒成立,则
的取值范围为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b6894e8c345a035e89ec672503a01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76779e6cfc4fd12973f014793b128a2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf7e0474550c9ddb0a04776ae57e3449.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2020-01-31 20:49:28
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【推荐1】已知函数
的导函数为
,对任意的实数
都有
,且
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在
上有极值点,则实数
的取值范围是( )
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【推荐2】已知函数
若曲线上存在不同的两点
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处的切线垂直,则
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【推荐1】下列命题为真命题的个数是
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;
;
; ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12c62904eaeb74aa0715ff466a29adb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
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【推荐2】已知函数
,若函数
恰有5个零点,则实数
的取值范围是( )
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【推荐1】定义在
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,当
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解题方法
【推荐2】已知
,
,且
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/859cf5bf57a50d2da19c0bb926ce9c18.png)
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【推荐1】已知函数
的定义域为
,
为
的导函数,且满足
,则不等式
的解集是( )
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【推荐2】已知函数
,下列说法中正确的个数是( )
①函数
的图象关于点
对称;
②函数
有三个零点;
③
是函数
的极值点;
④不等式
的解集是
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78f6453b5091e1ef47791bb829646220.png)
①函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edaef66a0582e95fb5c57a405acdea9a.png)
②函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb45f673c56a289ea78831c9237e8d20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
④不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/146944775eb0e8e4c84bedef892a1f1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29f48e1c656aace41360467f254e359d.png)
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,若
成立,则实数a的取值范围为( )
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