已知函数
.
(1)求
的单调区间;
(2)证明:当
时,方程
在区间
上只有一个解;
(3)设
,其中
.若
恒成立,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f09744520f5c31d176a1a232a3cd388d.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)证明:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c342d52fc26cc550a45b80756903bee6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02e1c9c97de9198d47306216e9961b80.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a43854fe91326fa1da1aa8da2fa010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bdf04f070224d193aaa2d0b13b96d48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
更新时间:2018-07-18 09:28:27
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解答题-问答题
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真题
名校
【推荐1】设函数
,其中常数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d660cb98d8f5b7a8730822993b3af85.png)
(Ⅰ)讨论
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(Ⅱ)若当x≥0时,
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05494657a365a8eedb37c42041d4b72a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d660cb98d8f5b7a8730822993b3af85.png)
(Ⅰ)讨论
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b6894e8c345a035e89ec672503a01f.png)
(Ⅱ)若当x≥0时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b6894e8c345a035e89ec672503a01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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(1)当
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(2)设函数
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解题方法
【推荐1】已知函数
.
(1)若函数
在区间
上单调递增,求实数
的取值范围.
(2)设函数
有一个极大值为
,一个极小值为
,试问:
是否存在最小值?若存在最小值,求出最小值;若不存在最小值,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7568959f58a0e5602151ff1eeffa49f3.png)
(1)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2944fd32561b692f8405cecf26335d9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71297b58283eecdd3449b10b71f5a6be.png)
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【推荐2】已知函数
.
(1)讨论
的单调性
(2)若
,求证:
①函数
在
上只有1个零点;
②
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ce2f2813efe48e09d6b73a070b839bd.png)
(1)讨论
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若
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①函数
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d562dc22dfb3b81d0c3f88b54d063c2f.png)
②
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名校
【推荐1】已知函数
,
(1)讨论函数
的单调区间;
(2)求证:
;
(3)求证:当
时,
恒成立.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcda8385f9ceac2bc360320d3e2f0891.png)
(1)讨论函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/743f43accc9e4c271896b3411e0df10a.png)
(3)求证:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/006dd721f6e19ee105cf6e3a10b69c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70a8de478b4c7988d7edd88a3320866a.png)
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