若直线
与
的图象有三个不同的交点,则实数
的取值范围为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4d12362d4b8dd25813953e1c5a94b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a06fc6b315febd3c658655916ea3a9d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
更新时间:2023-07-31 21:51:57
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【知识点】 利用导数研究函数的零点
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【推荐1】已知函数
,则它的导函数
的零点个数为______ .若存在
,使得不等式
有解,则实数a的取值范围为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55ae17e0f0d64c2b5d94f12346bd52b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d0c99ddd028f0bc3b1d64924ff0f61.png)
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【推荐2】如果两个函数存在零点,分别为
、
,若满足
,则称两个函数互为“
度零点函数”.若
与
互为“
度零点函数”,则实数
的取值范围为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b95ddc4b4add7f825a74246bad338808.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1c40019723f4e335c9d3dee15ac1c53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a837f60e9e3f8b5b6af9d60edd0d37eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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