名校
1 . 已知函数
,则下列命题为真的个数是( )
①
的极小值点为
;
②若存在
,使得
,则整数
的最小值为
;
③若
,则当
时,
有两个零点,且其中一个零点所在的区间为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9a45a166e350e41316ff1bb39b23230.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df87927dc77cadd6e99be244d8ed8e22.png)
②若存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee21db6628e4db3f5831370549fa96b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92755ed40510a358dcb77392749fd792.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d0ebe1f9cf6eef40ef0f26f2afa77f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fb58461e483f28100cf5bc88f33d870.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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