名校
解题方法
1 . 已知函数
(其中
为自然对数的底数),若方程
有三个根
,则
的取值范围是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e5004e357cbbe8d734086796276cc86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/041a7c8fc017f596542c5e6ec7d1c40b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9c0d827ef8598ba6b70b34b2bdcd1e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcee20976de0e0e8c1ccd7a951674691.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0ccef9f8453e91750d9700897cad78.png)
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名校
2 . ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070c85abc0c7a798f5100c04a7adc35d.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070c85abc0c7a798f5100c04a7adc35d.png)
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名校
3 . 已知集合
,其中
且
,若对任意的
,都有
,则称集合A具有性质
.
(1)集合
具有性质
,则
的最小值__________ ;
(2)已知A具有性质
,若
,则
的最大正整数为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892dee02e1d092169603dd5d14f54339.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d290a4927c50661098e2fbea58d77b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b80b8f7dbceb91cbc1c2845cf355714.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9d41b6356cad22d0cba60be8f9984b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd24a572b923f59906ebc90d3aa311cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5e86a882ef57f44f0ad22836079afe1.png)
(1)集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7372d99239161e3b340207bd0949ea0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32efe4eff75508cb93e828c735dcb695.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)已知A具有性质
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/353433462b58fe2eba495f2589b81380.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd7484924caa71b21fe45e373385f30a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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