已知函数
,
.
(1)若
,求
的单调区间.
(2)若
,且
在区间
上恒成立,求a的范围;
(3)若
,判断函数
的零点的个数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbb232ea4e4d621ebca318f39e234946.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10bbdef421c976962a270a2beabbad91.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10ede78fd7ac619ea597856254bb5d75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d752d8db8a05b3ec7312f6ac8b64a07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f909328384f9c52134243753d9c954ef.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0d30e582553a6e95f13fd7ddb571f4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eed6aac5d3086f2e59edd21470391862.png)
2023·天津滨海新·模拟预测 查看更多[2]
更新时间:2022-12-26 15:31:44
|
相似题推荐
解答题-证明题
|
困难
(0.15)
名校
【推荐1】设函数
.
(1)求函数
的单调区间;
(2)若关于x的方程
有两个不相等的实数根
、
,当
时,证明:
.(注:
…是自然对数的底数)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/603589540f7897790f99a8d75fd725f9.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若关于x的方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5809a06357f94fc7a2156c7e7af1ed2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffd888afdcfdb3e91a157d50f65e915e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9b741ffe4fcf3227685a7439071c66c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba1cf765d06d182c85b65daa5f55fd07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5a35e5501b2700f624bd4a9144fc9ec.png)
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解答题-问答题
|
困难
(0.15)
名校
【推荐2】已知函数
,其中
.
(1)当
时,讨论
的单调性;
(2)当
时,
恒成立,求实数a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a56026d2ab8c979e9bd3d4988b0583e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10bbdef421c976962a270a2beabbad91.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd5cdde751120c6deab563a6f7f8cf05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6212c2fb3f084d5fb737b3e64e3f3012.png)
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解题方法
【推荐1】定义:函数
,
的定义域的交集为
,
,若对任意的
,都存在
,使得
,
,
成等比数列,
,
,
成等差数列,那么我们称
,
为一对“
函数”,已知函数
,
,
.
(Ⅰ)求函数
的单调区间;
(Ⅱ)求证:
;
(Ⅲ)若
,对任意的
,
,
为一对“
函数”,求证:
.(
为自然对数的底数)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b426608a06477f57cb994f4d00e4465d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0f121036d30c000b01b7be98d9c8a99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11e685edd2226794e07c27f60acec2c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4994b0dae849313166b4dc20049a8650.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbc1bc250c8a6523a1be394ff48d4a51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e413b2bf0d67d3d222246474e71c705.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f74219fde8f798ff4b3ad483821c5a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fb96975f157002edefc88949eb1904d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b426608a06477f57cb994f4d00e4465d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0f121036d30c000b01b7be98d9c8a99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4714fdcec01122e7aba38e3d1ddd388e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdef85d50578d84a92ffcc754f7afddb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
(Ⅰ)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(Ⅱ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef5ec0e806beaf399bbd30011cd2f0ef.png)
(Ⅲ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5dd5964a75ea201244f2c9b62ccbb39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09256752badab8d69ae679796896ed97.png)
![](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/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e2a5e1c924c41c6ef83a55d003382c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/168b3e4b1d6f04226fa2687a72a268b4.png)
您最近一年使用:0次
解答题-问答题
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困难
(0.15)
名校
【推荐2】已知函数
.
(1)讨论函数
在
上的单调性;
(2)若
,对任意
,不等式
恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a625077f825ca62d6cdf651d8931d3f4.png)
(1)讨论函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caf87d9d48c3de0a5e9f1a70e51a0bef.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45ef3cda486b19d5441d284181302934.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21d03b29af4e3206af656a142d17657f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87270c72ca3a5bfaf1f95257cc3ed8a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
解答题-问答题
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困难
(0.15)
【推荐3】已知函数
.
(1)求函数
在
处的切线方程;
(2)若方程
在区间
上有实根,求
的值;
(3)若不等式
对任意正实数
恒成立,求正整数
的取值集合.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cbc9c8f763564170df4d685e50bf76a.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a1cfb60420ff7e72c1b9d64f69ae063.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9c81965854dbe52a513241f196edf2c.png)
(2)若方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f8bfb563f79688d136e0cb958b5153c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f88d46f4950e93ed73244877c4c7b88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(3)若不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d889f0c43465bb96e3ce0874318d6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
解答题-问答题
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困难
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【推荐1】已知函数
.
(1)讨论函数
在
上的零点个数;
(2)当
且
时,记
,探究
与1的大小关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a81eeb610596766eb3d36bf33f603953.png)
(1)讨论函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/499a8449e8bb253065463c23f3ff5860.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dff537b9287dffb28e89bfc2bf5ed723.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f2a14d9c7f3d948525c2660db272223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/531bcdb6324cb5a759301daddf9768c0.png)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
名校
【推荐2】已知函数
,
.
(1)讨论
零点的个数;
(2)当
时,若存在
,使得
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/848ac7f1e6097155de301295e8bb4707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10bbdef421c976962a270a2beabbad91.png)
(1)讨论
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(2)当
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcee20976de0e0e8c1ccd7a951674691.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2e45e961dd36b8f85703c91f248da3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b413d04d34978c0b306fa4f1df9d1e.png)
您最近一年使用:0次