已知函数
,当
时,恒有
成立,则实数
的取值范围( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2857be0adba5705d331e956c20cc28f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6eec7d75a66a4407631f75320bb8b15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23bb1627754ba409c62a3b9485af953f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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更新时间:2021-02-05 23:01:40
|
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单选题
|
适中
(0.65)
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解题方法
【推荐1】已知函数
,
,对任意
,
,都有不等式
成立,则a的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c71d826331c542c8f21bee4bce262722.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19b267dc2c1b9365867d738d08184b13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3d5a5e70f64f0933ae1e4ddec5fa2c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0abd009b97a996b283d67ff53fefa024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec6154e00013d9dee84c0e941f676ea9.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
单选题
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适中
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【推荐2】已知
若对于任意两个不等的正实数
、
,都有
恒成立,则
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd5eff87cd234a6ac232ae52f06bef9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21442438d95f58b64c2083cfe6cf934d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
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适中
(0.65)
【推荐1】已知偶函数
的定义域为
,其导函数为
,当
时,
,则不等式
的解集是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/724340d69477c0ec2418c392b22b1cab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4848b57ee37ee9649b6c97dde28f950a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c7b5ecb240ef95aa6428fb65837f7b8.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
单选题
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适中
(0.65)
名校
解题方法
【推荐2】设
是定义在
上的函数,其导函数为
,若
,
则不等式
的解集为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7994bbcf39f4dda34e877b21af71f103.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05666d94e091ce20c1072a1e853f4ae5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c1aafd0cd90e7856184c65f4a2211d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96e85f9d46ac19139f429b7ba7d0e867.png)
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您最近一年使用:0次