已知函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69d542b692e6bb83500eefe0b7a0cdf7.png)
,
(1)若曲线
在点
处的切线为
,求
的值;
(2)讨论函数
的单调性;
(3)设函数
,若至少存在一个
,使得
成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69d542b692e6bb83500eefe0b7a0cdf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6369ea989d998028ed1474f6645ec9a.png)
(1)若曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bea9227dd0104da58e0c40952cc87ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bebb3b7f47e0decd48e64cb32aaa5903.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/219ba6c8a1b54598db1a78cab28d9d30.png)
(2)讨论函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(3)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a00eff7786fe9330a948e2010e91f254.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03a2847e84937f36663faa304e296277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61a6edac5bdaa8e5d37f538ae76236e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
更新时间:2016-12-04 22:54:26
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解题方法
【推荐1】已知函数
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(2)令
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cf4eb490be6c2577947dd136dc980ca.png)
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(1)求
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(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
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(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdedf50aecf436a1d423252b4f39e335.png)
(2)若
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【推荐2】已知函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4df01b062bfc0fc620d02858249682.png)
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【推荐1】已知函数
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(Ⅰ)讨论函数
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(Ⅱ)当
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(Ⅰ)讨论函数
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(Ⅱ)当
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【推荐2】已知函数
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(1)当
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(2)讨论函数
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(1)当
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(2)讨论函数
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(3)当
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【推荐3】已知函数
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恒成立,求整数
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