已知函数
,
.
(Ⅰ)若
,求函数
在
的单调区间;
(Ⅱ)方程
有3个不同的实根,求实数
的取值范围;
(Ⅲ)当
时,若对于任意的
,都存在
,使得
,求满足条件的正整数
的取值的集合.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6963c7a91f638764eeca157ca6adce24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e69392d21261afd8e5e5f096634669.png)
(Ⅰ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b108ab31cc093f03cf48ad65429889e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09b29a7faa14a6e09d0db2d04f4ced03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebe1abd3d67945dbdafaa8e57765c77d.png)
(Ⅱ)方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13055766424f8f5c91a8c5099dc03205.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(Ⅲ)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c10b6a6435e6f66a67f9f57fa60c69c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a5fc3009c0a28f8730b0a5f4b98419e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9540f894ac17cac2d5688a2287b8ba76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
更新时间:2017-05-16 13:35:05
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【推荐1】已知函数
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【推荐2】已知函数
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(1)讨论函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dda368981b6f14366e72bf97e2a33e7.png)
(2)当
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的导数)已知
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a7d638c9a5bca41e7129446432e96cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/870ebc2f7aabb028024894568d749934.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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解答题-证明题
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解题方法
【推荐2】已知函数
.
(1)若
在
处取得极小值,求
的值;
(2)若
在
上恒成立,求
的取值范围;
(3)求证:当
时,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c6391131de160fd6a96724d70c43a36.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
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(2)若
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(1)讨论函数
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②在①的条件下,当
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52c79728eda595218be2154adf12590b.png)
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(1)讨论函数
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(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d33da711e50e96568facb18cef27165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4db313896b6c71da7e26673caf359654.png)
①证明:函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a813b5adbf5c7082561237894ba6d599.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab5e0524def52baf53480b8726784ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
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