已知函数
,其中
,求函数
的单调递减区间.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a52b1a62b7c3f282c10b2d0113af2009.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e69392d21261afd8e5e5f096634669.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
2020高三·全国·专题练习 查看更多[1]
(已下线)考点51 单调性中的分类讨论(练习)-2021年高考数学复习一轮复习笔记
更新时间:2020-08-27 20:49:15
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解题方法
【推荐1】已知函数
.
(1)证明:当
时,关于x的不等式
恒成立.
(2)若正实数
,
满足
,证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f06495bda4617340d809fb64cc300fe.png)
(1)证明:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/655b06387179d53c1e474fcfcb408b1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1508082ea7ec2789975f58e3c4b15451.png)
(2)若正实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15664cfc89712268f585279990b2e953.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6330de640d51bb3970813289a4de3a5d.png)
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(0.4)
名校
【推荐2】设函数
与
的定义域为
与
分别为函数
与
的导函数,若存在
,满足
且
,则称函数
与
为“优美函数”.已知函数
与
.
(1)已知
和
,求证:
和
;
(2)当
时,若函数
与
为“优美函数”,求
的取值范围;
(3)当
时,已知函数
与
为“优美函数”,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6085b118b86f7f4dd54864e113cd595c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6cc4a85bbf152031dc8ebd182e44ead.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5685f66553971f62cb1d8cee9a49244.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f59ef75c0e906e108cad5f4d34ae21ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6085b118b86f7f4dd54864e113cd595c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6cc4a85bbf152031dc8ebd182e44ead.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3102c0a2f53b80f9dddbf9352537e8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59a4a84e03dab8e8aa04f597b4fcf998.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c668385fc2475e2600074c350d961a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6085b118b86f7f4dd54864e113cd595c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6cc4a85bbf152031dc8ebd182e44ead.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81d6c95ea3b9d0ff3e90a702d2db77d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7024f7708dcc7deba3b8baa1afe6b40a.png)
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/155672d8c17847792e73c07cb94fcff3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7300497edb92cd1fedd641dd1c5a364.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6694d977c5ac4d7b5342d18728f4c489.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d7e549248d2c6d1c8706ec49f19a59b.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3c442579603164f3fc19458677d307.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/0a6936d370d6a238a608ca56f87198de.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d33da711e50e96568facb18cef27165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d4acc891e024b77f174039085580e48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83dcde657544ded718d8b7b0ff0537a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb7139148f3c934fdf505f2f020f023d.png)
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解答题-证明题
|
较难
(0.4)
【推荐1】已知函数
.
(1)讨论
的单调性;
(2)设
,求证:当
时,
在区间
上有且仅有2个零点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c92f203404d632cfa8283dbb19276346.png)
(1)讨论
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e8a5aecc557bc20fa9d0ba2729f1c74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46be55c8f2760d6db125f46691a3de48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6664c38250ffff0722982703cc8ea33b.png)
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较难
(0.4)
【推荐2】已知函数
.
(1)若
的极大值为
,求
的值;
(2)当
时,若
使得
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82f64570f23007d2ff92d009bbad9e25.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b019fbfd1961cff8f3ff211d957c633.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0d30e582553a6e95f13fd7ddb571f4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3806cf55937adabb166ebb69afb6437d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d1540b6b10f07a867618a1eec02e2a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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