已知函数
存在
,使得
,则
的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c52ff1aabdd708e2b43503af0ae0eff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24292cedd5e93a887dd9d1fe76f83313.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2e45e961dd36b8f85703c91f248da3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/348bda9aec03c459b6841c401aad12f3.png)
更新时间:2019-11-21 07:57:45
|
【知识点】 根据函数零点的个数求参数范围
相似题推荐
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适中
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解题方法
【推荐1】已知
是定义在
上的偶函数,且
,当
时,
,若函数
(
且
)有且仅有
个零点,则
的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3ed15aa3dcc4211fb520b5b942c989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45569f3cc446c6bdc97343301ee1d27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/094bdef5a5a692a6cb194c8a9fea7266.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ec84404bbf6cf4a9d992e1760dcfdd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/808ed6f1ef47c4537fceea19e7c38062.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c400a615a16a1662de98dfb4e49d58d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐2】已知函数
时,则下列结论不正确的是_______ .
(1)
,等式
恒成立
(2)
,使得方程
有两个不等实数根
(3)
,若
,则一定有![](https://staticzujuan.xkw.com/quesimg/Upload/formula/360880b267f405ee5900bcbda6c9576b.png)
(4)
,使得函数
在
上有三个零点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/665b266ba68a0f98f6a664d9036c69a7.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c780149aef1bd77162e85f7f8906a6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdb558e17c9818610772917878d82d03.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af8b60c927800167ab8864c131186e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07c21c4465fc007e3ecd8ea8a9c886b1.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aae2c13ad91dae29cf4d9f794a8808dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33bd24e647a626899a243a3f3984f90a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/360880b267f405ee5900bcbda6c9576b.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e01a59f18a0430e9a4f4734a3535a05d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab6b28c29a9e823cf1d6c764323d7e15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
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【推荐3】设函数
,
①若
有两个零点,则实数
的一个取值可以是______ ;
②若
是
上的增函数,则实数
的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c87a9d6ceb62c7c17b2ce2b0f039199.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3ed15aa3dcc4211fb520b5b942c989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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