已知函数
,
.
(1)若
在
处取得极值,且满足函数
有三个零点,求
的取值范围;
(2)若
,对任意
,
恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aefa673751e5e86c1874821fec2624c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/606aa29c4036a4089ac4e243190fcaac.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55aa0a20848c37c1892c567b2315e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd876a2ed79c64bacc3e64b8ee92735e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf68b3332515cb91760cce1bbcbbed7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24cc8180fa7b13a7292e9a0ad69ec9b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
更新时间:2021-09-17 21:22:51
|
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较难
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解题方法
【推荐1】已知函数
,
.
(1)讨论函数
的单调性;
(2)若存在直线
,使得对任意的
,
,对任意的
,
,求
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59a051a89d3b3304d5053ec2b3cd3644.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/019aad6145f7f36c7c8e2910cc03696d.png)
(1)讨论函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)若存在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e915b67f8f747698b8b46d37bc453667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/966b60302d80d8613675bb3dd5c03164.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9035ea1d8f2d20018e37eddd2deae7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4011fc8ac1d2ecc983470fd1720fd961.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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较难
(0.4)
名校
【推荐2】设函数
,
,
.
(1)若对任意
,
恒成立,求
的取值范围;
(2)
,讨论函数
的单调性.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ddaa93e2b623465da13f75d3abf7237.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f8c2b209f91d40d1f5c5aa985a906e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8f95782cbc054a7eea10a3223b50991.png)
(1)若对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff422f3c701584afe9614d664e883d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1bd153c6ead3f8e4702db5399db364c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7863b54185da5a3f1a765e1aa0577e76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f786a5701dc1a8a015e8843c3360151b.png)
您最近一年使用:0次
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较难
(0.4)
【推荐1】已知函数
.
(1)求函数
在
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(2)讨论函数
在区间
上的零点的个数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05aa3122841be31d18ee93fa7ceef063.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef5cec7aa1e307f4282544cdfb47aed3.png)
(2)讨论函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82a7792efd7f82bfa7549db4cb6ca761.png)
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2】已知函数
.
(1)讨论函数
的单调性;
(2)求函数
的零点个数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a4e8751371c0ae494af9044d879451.png)
(1)讨论函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d479a86a1711709b2d100fe4daf3e7cf.png)
(2)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01cf8040b919a5f0dc4420e619a9e971.png)
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】已知
,
.
(1)讨论
在区间
上的单调性;
(2)若
,且
在
上有三个零点,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34c4ddfd240481b18664536e2c611ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37bd9350b24d589d8290d9d990798af8.png)
(1)讨论
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b6894e8c345a035e89ec672503a01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/304226ca50149b49702928e44d565964.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac974702100a7c610b56a3774c43392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61c388166862b3ccfcc7ca749ebe5949.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/304226ca50149b49702928e44d565964.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次