2023·全国·模拟预测
1 . 已知
.
(1)若
恒成立,求实数
的取值范围;
(2)若
时,
的最小值为
,正实数
,
,
,
满足
.证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f1bcf7ac45a798633b84ab5be4c9ed0.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d752d8db8a05b3ec7312f6ac8b64a07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/168b3e4b1d6f04226fa2687a72a268b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d360781e1ecf933ca4b64bc6639cb9ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9981bbe0552fc30c1ca01422df5d4207.png)
您最近一年使用:0次
名校
解题方法
2 . 已知不等式
的解集与关于
的不等式
的解集相等.
(1)求实数
值;
(2)求函数
的最大值,以及取得最大值时
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09a27e985a23349d2da23a32ae2d5933.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1282abd59be29c833edd739a413a0fc7.png)
(1)求实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/663a61ad241d5d874c9a9362f0ee917c.png)
(2)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf739ef462dfd763e9a4ca14ac9bbdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
您最近一年使用:0次
2020-03-19更新
|
314次组卷
|
3卷引用:2019届云南省曲靖市第二中学高三第二次模拟考试数学(文)试题
3 . 已知实数
、
、
满足
,
,
,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cec12441802f71e803efaf2c62ee588.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea63bc7cb16bb72fd3fe1a58bec5143b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8720d2743b33079a807740dc0d761ad.png)
您最近一年使用:0次
2020-05-09更新
|
281次组卷
|
3卷引用:2020届江苏省泰州市高三下学期调研测试数学试题
4 . 已知正数
满足
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2085ca7f404aa949251dbbfb6739a8b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c193632ae440b4ad219abc2dd7eb8d69.png)
您最近一年使用:0次
2018-10-23更新
|
513次组卷
|
2卷引用:江苏省徐州市2019届高三第一学期期中模拟试卷数学
解题方法
5 . 柯西不等式在数学的众多分支中有精彩应用,柯西不等式的n元形式为:设
,
,
不全为0,
不全为0,则
,当且仅当存在一个数k,使得
时,等号成立.
(1)请你写出柯西不等式的二元形式;
(2)设P是棱长为
的正四面体ABCD内的任意一点,点P到四个面的距离分别为
,
,
,
,求
的最小值;
(3)已知无穷正数数列
满足:
①存在
,使得
;
②对任意正整数i、
,均有
.
求证:对任意
,
,恒有
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50a272adba0f1120109824440f0e252c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba031aac09bdee5b36549bb6e68bdb5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50a272adba0f1120109824440f0e252c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1602c6064af12eed3fd1291f8272d93c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/944ab11422d7221e45aa4cc6d868828b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34039940c47c92f3660e9dc7c27e5961.png)
(1)请你写出柯西不等式的二元形式;
(2)设P是棱长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5edf900c810371fb21297c15f86d8743.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b31ac1def558351e2e3ed1235c570530.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/342d0252c1b2f7d2a84b5c985d19d547.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d31659f106fba3c9750661eb0e3c3eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dde93376f5d29f8f7d501122759b0ab.png)
(3)已知无穷正数数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
①存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c24ecf9e59082e563372b12981d03fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1b5cbf6a7e19a347e95de7f119094fb.png)
②对任意正整数i、
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8598147874a35becc05e7bf4d90ce096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a33ac34aa03dc7f0a5faad6dc664ec6.png)
求证:对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5818ede14d21f6df9ef9c2bfe09286c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c229aec38946b710076588b7710381c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d191d6de821fbb06a51b5a20112db6de.png)
您最近一年使用:0次
名校
6 . 选修4-5:不等式选讲
(1)若关于
的不等式
的解集为空集,求实数
的取值范围;
(2)对任意正实数
、
,不等式
恒成立,求实数
的取值范围.
(1)若关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c017e22cabb527e4abbe7bbaebd47e8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)对任意正实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e1f0deaf8dcba46e2a2e870fd331d5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次
2017-04-15更新
|
561次组卷
|
4卷引用:2016届宁夏石嘴山三中高三下四模理科数学试卷
解题方法
7 . 已知
,
,
,
,
,
都是实数,且
,
.
(1)证明:
;
(2)若
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f9223bc24df8d429d743692fff7c06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f67d7ae18bbc9df40542770475b861d7.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e8d2428c7d1a35df9759914dddbf0f6.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72e96f2368d04db6d0e05de46e97e29f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf5534e61fc575a4c27c202228840305.png)
您最近一年使用:0次
8 . (选修4—5:不等式选讲)
已知正实数
满足
.
求证:
已知正实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d10449bc77d692a7270e0f20a68cdf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a03337341f614edf4c2a4aea12f0aa.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac9b0644843895d41546143e3ffc3822.png)
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2012·福建福州·模拟预测
解题方法
9 . 已知实数
满足
且
的最大值是7,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3fb0c9c7e30bbc0ec8c3521577ee4fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb86005728847de7f6872accecc1a4b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1433c8103033c67232f2f9ae189608d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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10 . 已知
均为正实数,且
.
(1)求
的最小值;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74f028b275620f54d2e439d8beed9b9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be97cd1c7111b654d87d8fbb63b6a84.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2789e4dc57686f83a68e42c41eef19be.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/703be7e02914ccb2dbb8202c0686e716.png)
您最近一年使用:0次