已知函数
,
.
(1)讨论
的单调性;
(2)若函数
有三个零点,证明:当
时,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5918112b1f73745562c8bbb9a30d7108.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e69392d21261afd8e5e5f096634669.png)
(1)讨论
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b6894e8c345a035e89ec672503a01f.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b6894e8c345a035e89ec672503a01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67c87b80c5e5bbe787491567b0722661.png)
更新时间:2021-05-15 11:24:43
|
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解答题-证明题
|
较难
(0.4)
【推荐1】已知函数
,
,
.
(1)若
,求证:
;
(2)若函数
与函数
存在两条公切线,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/605e2f1014570bf34ea21c07c0d039e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d27bcb0a5f3d22e9df052879fb0d0d4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22dd8b3dc4c609bab82d356a5cc2208d.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b108ab31cc093f03cf48ad65429889e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/447d6f62c09c1d05346fd16a24159f6e.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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|
较难
(0.4)
解题方法
【推荐2】设函数
,若对任意
,都有
(
)恒成立.
(1)求
的取值范围;
(2)求证:对任意
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e96546b3259afe4add331673fb835c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2fb40a36a293471742ce75f6b9635b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9e004d412add713770bdc614d78987e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)求证:对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2fb40a36a293471742ce75f6b9635b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc8fa15a0908636fe434e53be0a6bedf.png)
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(0.4)
名校
【推荐1】已知函数
.
(1)当
时,求
的单调区间;
(2)当
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,
,使得
成立,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01cec5c912eabdd77038a084042431da.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e10e1c43b86a8cd4360ca9b57232164.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29f3a248d7ed1af43902b06ee26b4dd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1015dba1406e8ecd663363cd4d331ec9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5689742e6274e003f48aaa291d91bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d141db3e7187a57e67798d8844073d56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a0b7fe73371e8614cb57249d6bc26e1.png)
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您最近一年使用:0次
解答题-问答题
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较难
(0.4)
名校
【推荐2】已知函数
.
(1)若
,设
,讨论函数
的单调性;
(2)令
,若存在
,使得
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77db8f6082e05bca2de252a23974aa04.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d74f580f23614ffafcbdb7aea27aa4.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8aafa3d5743fd569246489d0b63867ac.png)
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您最近一年使用:0次
解答题-问答题
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较难
(0.4)
【推荐3】设函数
.
(1)讨论函数
的单调性;
(2)
为
的导函数,记
,证明:当
时,函数
有两个极值点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1a25130b282a520aedfbcab83e69370.png)
(1)讨论函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/724340d69477c0ec2418c392b22b1cab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c765461ae1a6c70f5cbdcb6c932a22b.png)
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