1 .
,
,已知
的图象在
处的切线与x轴平行或重合.
(1)求
的值;
(2)若对
,
恒成立,求a的取值范围;
(3)利用如表数据证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f40b512163dd11b0523dd0da75f2206.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d440669c516d6dff0fedaf3eed41aca8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68c6b6a11760d0724b0b60e55970e229.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6581916f5a65edfea257c804efee007e.png)
(2)若对
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f832d9cca2d5c9d76d38374e2a258d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dc9ede2e55724383dd1093fc7fcdb59.png)
(3)利用如表数据证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9201fb7af855df0e2e7c82c2434a7b1.png)
1.010 | 0.990 | 2.182 | 0.458 | 2.204 | 0.454 |
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2 . 设
,函数
,若
在区间
内恰有7个零点,则a的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10bbdef421c976962a270a2beabbad91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ed2d6262a9a962d8ec5f6dc3a4e0eef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d562dc22dfb3b81d0c3f88b54d063c2f.png)
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