名校
1 . 已知函数
,给出下列四个结论:
①
,使得
有两个零点;
②若
,则
有两个零点;
③
,使得
有两个零点:
④
,使得
有三个零点;
以上正确结论的序号是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8baacabf2bc9579217ede26198a755b.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db9a3a0b0a40d2868e8df5ab8338e004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5095a28bb1b91bf6bed9e2cfbd76bb18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adec1c632407f10dff2914ffee83831a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adec1c632407f10dff2914ffee83831a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
以上正确结论的序号是
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名校
2 . 已知
,若
的图象与
轴有3个不同的交点,则实数
的取值范围为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb1e9e95264ce1975c8290a25ca8ec4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/982162499da753ce02dc03b0b61185fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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