已知三次函数
有两个零点,若方程
有四个实数根,则实数a的范围为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35c3f7b6d549b3dc3d47f2a5bc7640e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f55be052daf934a7459186902c02292.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2020-05-03 22:22:33
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单选题
|
较难
(0.4)
名校
解题方法
【推荐1】若关于
的方程
恰有三个不同的实数解
,
,
,且
,其中
,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d123bc142504bdc8587d5dace0167ab.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/291c25fc6a69d6d0ccfb8d839b9b4462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98bac0dc3f94631d4163e7e4672cb8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcd9218a657b17654c5d757a6f7dee9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35bacde908aec2c313978fc4309d82bc.png)
A.![]() | B.![]() | C.1 | D.2 |
您最近一年使用:0次
单选题
|
较难
(0.4)
【推荐2】设函数
,已知
在
上有且仅有4个零点,现有下列四个结论:
①
的取值范围是
;
②
的图像与直线
在
上的交点恰有2个;
③
的图像与直线
在
上的交点恰有2个;
④
在
上单调递减.
其中所有正确结论的编号是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8066f6c7b05b1dc18c92c74b0d136688.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f55cfcbb5c5950e18a8452b38bb17036.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074c228ffc7b1e306f8410afe7bc4b5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c4f684cbcc329baecb1d0272b09d236.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c50866229ec5a3640fb250f9bd2192b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71163f419555f2ed76075c8ff659fbfc.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eefa44964db83759aff6fc8dd7ef8f28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71163f419555f2ed76075c8ff659fbfc.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e68d62482d548bcd517188178fd36bc3.png)
其中所有正确结论的编号是( )
A.①② | B.①③ | C.②③ | D.①④ |
您最近一年使用:0次
单选题
|
较难
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【推荐3】已知函数
(e为自然对数的底数),函数
,若关于x的方程
有两个不相等的实数根,则实数a的取值范围是( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c1edeebd3b4d44964a0736811c62ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc1b9ff5619ecf65c4eeca63c87d6041.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dd35186329decd1623cb48c5f7d4209.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
较难
(0.4)
名校
【推荐1】已知函数
,若方程
在区间
上恰有两个不相等的实根,则实数
的取值范围为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56ab5112473c79a96b8128108b88bb4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f8bfb563f79688d136e0cb958b5153c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8938db94f49dcbe0c383fba0241bb0da.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
|
较难
(0.4)
【推荐2】已知函数
有四个零点,则实数
的取值范围为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1fa6865db5ddf9d32f0184fcc69dac5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次