名校
解题方法
1 . (1)已知实数
,
,
,
,证明
,当且仅当
时,等号成立;
(2)求函数
的定义域及最大值.
![](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/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c184edd63472d8ddf96e5f815515d929.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd68c14adb3cf12d8f77aec55a053284.png)
(2)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b04d66099876878ff404d2ee02a91c7d.png)
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名校
解题方法
2 . (1)已知
,比较
与
的大小并说明理由.
(2)利用(1)的结论解决下面问题:已知
均为正数,且
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b40d453ac56a449af2c33e31ff49c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf7e6232a3919536f7f3a5242b1a525f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df3f6d2577dd8df3852dd813267146f8.png)
(2)利用(1)的结论解决下面问题:已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c2fcfb667764b3b5e97feeecc43ea87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b0113fd4c7d157757571f9a009e02af.png)
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名校
解题方法
3 . 设
,
为两个正数,定义
,
的算术平均数为
,几何平均数为
,则有:
,这是我们熟知的基本不等式.上个世纪五十年代,美国数学家D.H.Lehmer提出了“Lehmer均值”,即
,其中
为有理数.如:
.下列关系正确的是( )
![](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/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee128ea692363f9a7b0cf0958e5f74e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54b9514b5e245327b05261ac9a946063.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/724be458b3b7ea423749ef82cfc43e2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9b58a456c1dcca5c0cdc3a2e9e3b906.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f521d02c04cc6b4f58c22f657150f23.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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2023-10-09更新
|
278次组卷
|
4卷引用:湖南省长沙市雅礼中学2023-2024学年高一上学期第一次月考数学试题
4 . 若不等式
对任意正实数x,y都成立,则实数k的最小值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/291623137d8271b3749b22fd8eb5ef34.png)
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5 . 柯西不等式是数学家柯西(Cauchy)在研究数学分析中的“流数”问题时得到的一个重要不等式,而柯西不等式的二维形式是同学们可以利用向量工具得到的:已知向量
,
,由
得到
,当且仅当
时取等号.现已知
,
,
,则
的最大值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2c857eec21dd64ccf0ba530883bb6cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bcab0226effeccd2a336c23079bc1be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06ec52de4dded0d72469acceca3f1549.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79e891ae2a63b7c20e00cb05e9acb71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab138a74db444886abc7fe18947f7a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce3a34d6f60032718820c3da2b07786b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90e8d5d7fed033f48270b1ff825fcd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ff7e62312dbd1cd5b50a6dc7fdfc166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32e861f686ed5a72e6bdeb4c93ec1502.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2023-06-27更新
|
508次组卷
|
4卷引用:江苏省盐城市2022-2023学年高一下学期期末数学试题
名校
解题方法
6 . 在
中,
对应的边分别为
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41cc48b9017b4828713efe931111e782.png)
(1)求
;
(2)奥古斯丁.路易斯.柯西(Augustin Louis Cauchy,1789年-1857年),法国著名数学家.柯西在数学领域有非常高的造诣.很多数学的定理和公式都以他的名字来命名,如柯西不等式、柯西积分公式.其中柯西不等式在解决不等式证明的有关问题中有着广泛的应用.现在,在(1)的条件下,若
是
内一点,过
作
垂线,垂足分别为
,借助于三维分式型柯西不等式:
当且仅当
时等号成立.求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9c1e84aaa7e1b5c1283075b36c72fb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41cc48b9017b4828713efe931111e782.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)奥古斯丁.路易斯.柯西(Augustin Louis Cauchy,1789年-1857年),法国著名数学家.柯西在数学领域有非常高的造诣.很多数学的定理和公式都以他的名字来命名,如柯西不等式、柯西积分公式.其中柯西不等式在解决不等式证明的有关问题中有着广泛的应用.现在,在(1)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c98b702a52b5262939995dd9f77d1bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a0e08a39c6619123557148d195abfbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/927456b0989846a2f1573844bbaa2105.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cde96534c28492e563efd72f941bed5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb5ba135022def1bcc1cddea66496706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ebbd1d0e4d44a11d9b0d65e73eef212.png)
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2023-06-11更新
|
1712次组卷
|
8卷引用:重庆市第一中学校2022-2023学年高一下学期期中数学试题
2023·全国·模拟预测
解题方法
7 . 已知a,b,c都是正实数.
(1)若
,求证:
;
(2)若
,求a+b+c的最小值.
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5ac3bc2d9585aeacc69ce70e31624f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d939ea6dd48e405968c9d79362716155.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38e4392332ef50858d2a95fc64bac5b0.png)
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名校
解题方法
8 . 设
为
的重心,若
,求
的值为______ ;
的最大值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2372c8c6322f36a6444e6f3485c27f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e373180022c31e6f3b0b35a00c316bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22b0b4385da693c68505fe76c9c60520.png)
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名校
9 . (1)用向量方法证明:对于任意的
,恒有不等式
.
(2)已知
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b40d453ac56a449af2c33e31ff49c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dd9c43e90eb3fc06769222169c5081c.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a321112ae2829a4783f7e4a1f022183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebd567268cfef304e0419b25ded469d0.png)
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名校
解题方法
10 . 已知
,
,
,
都为正数,且
,
,则
的最大值为______ ;此时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
______ .
![](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/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a7dbc702617c765a573961953cc0901.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dbb69422c8d10572072ebf922aaedb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1019d4ad2e3fb4a7abb66e0e9e55b556.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
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