名校
解题方法
1 . 记
的内角
所对的边分别为
,已知
.
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e717c243991f038d7bc21a0fdad985b.png)
(2)若
的面积
,求
的最大值,并证明:当
取最大值时,
为直角三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce7af7c5df749c6fa9bbe87faa72c66d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88f2599ca8b6b683e57a82699c8b1ebb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55abde5108e7846f496584016ce82286.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e717c243991f038d7bc21a0fdad985b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3a88d9c428cc72bdf012746e2781a64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
2022-12-06更新
|
756次组卷
|
3卷引用:河南省洛阳市强基联盟2022-2023学年高一下学期3月月考数学试题
2019高三·江苏·专题练习
2 . 利用基本不等式证明:已知
都是正数,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb750904ec9f5877dac7638e45e45936.png)
您最近一年使用:0次
2021-08-31更新
|
2384次组卷
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15卷引用:第07讲 基本不等式-【暑假自学课】(人教A版2019必修第一册)
(已下线)第07讲 基本不等式-【暑假自学课】(人教A版2019必修第一册)(已下线)2.2 基本不等式(第1课时)(导学案)-【上好课】(已下线)2.2 基本不等式(第1课时)(分层练习)-【上好课】(已下线)专题7.3 基本不等式及其应用(讲)-江苏版《2020年高考一轮复习讲练测》(已下线)专题7.4 基本不等式及其应用(讲)-浙江版《2020年高考一轮复习讲练测》(已下线)专题2.2 基本不等式及其应用(讲)-2021年新高考数学一轮复习讲练测(已下线)专题2.2 基本不等式及其应用(精讲)-2021年新高考数学一轮复习学与练【新教材精创】3.2.1+基本不等式的证明+学案-苏教版高中数学必修第一册【新教材精创】3.2.1+基本不等式的证明+教学设计-苏教版高中数学必修第一册陕西省咸阳市武功县2020-2021学年高二上学期期中数学试题陕西省汉中市部分高中2020-2021学年高二上学期期中数学试题(已下线)第02讲 基本不等式(教师版)-【帮课堂】2021-2022学年高一数学同步精品讲义(人教A版2019必修第一册)(已下线)专题2.2 基本不等式及其应用(讲)- 2022年高考数学一轮复习讲练测(新教材新高考)2.1.2基本不等式(已下线)第04讲 基本不等式及其应用(十大题型)(讲义)
解题方法
3 . 已知
,求证
.某同学解这道题时,注意到结论中的三个量
,
,
.由已知条件得到
,
,
.进一步发现三者的关系:
.又观察左边式子的结构发现就是两个数的倒数和,从而联想到以前做过的题目“已知
,
,求证
”,类比其解法得到题目的解法:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f60d4d44e161c4c3e151ad73024a8228.png)
,当且仅当
时取等号.所以
.求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/497d269c30eec393e3f0e877ddbe2983.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/323f4e181b418a66cc36d75e0f8da126.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9f2416d1f75a45a314331146550832e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9db8d3facff8f90f28a936fc5b3ab878.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ea712984ea5017140e20bee226fd5af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/481ee0d1e39e92a4732eea90225eb94c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/936553b69099e03189581a42a5c1d8aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6e90787c63ca5b5f1a45e0f6e85aaa1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0c05be59bdd7874fd8e9ee5ba5b17f4.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/86546d8c56d9c72822cc2c834e240ad1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f60d4d44e161c4c3e151ad73024a8228.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55eb4703dc394b53fef7d12030c470d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/914c9d4dc14490413e77f6262d2a7aa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/323f4e181b418a66cc36d75e0f8da126.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81e743594b98ac2006344494dddfb345.png)
您最近一年使用:0次
解题方法
4 . 在
中,已知
,求证:
为等腰三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2681f0d1732bcaa8d6362fbd1fa6caa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
5 . 已知x,y均为正数,试求证:若
(p为定值),则当且仅当
时,
取得最小值
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f43ec9879c5c85482795c2676c3cc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07b9d5aaaceaa3ac514d17fcfefbf9b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b88584cf1df43e28d03592c7998b1653.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280f7cc99fa100b85cc7a133811a9a8d.png)
您最近一年使用:0次
2023-10-07更新
|
81次组卷
|
3卷引用:北师大版(2019)必修第一册课本习题第一章3.2 基本不等式
6 . 已知
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b804002ee3d72ff947cfc8426f90047c.png)
您最近一年使用:0次
2023-10-07更新
|
258次组卷
|
3卷引用:北师大版(2019)必修第一册课本习题第一章3.2 基本不等式
23-24高二上·全国·课后作业
7 . 设
,
,
,
是等比数列
的项,且
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f255d0395fba51ca2d44293cca42e0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f84aac9ff61204b05af0202c322ca3e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/681ae1522a36768618f7ddaf74abbb7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/998eef899e26a71a49f5d91cc130d5e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a63a5d360f9b7fd5f709680810b34ed6.png)
您最近一年使用:0次
8 . 设
,
为正数,证明下列不等式:
(1)
;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a37a329dd544397413f3885349e8109.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aa23408bcc9f6200f22a310e5f2569a.png)
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9 . 已知
是数列
的通项公式,其中
和
均为常数.试判断数列
是否是等差数列,并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15ff304e5b435692165825f0a6d8448e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
您最近一年使用:0次
解题方法
10 . 在
中,角A,B,C的对边分别为a,b,c.已知
.
(1)求
;
(2)若
,求证:
三点共线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9c8267bd5810e85a99186af63de8865.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/6/148ea5a5-81db-49b9-bef2-6aef55de00d9.png?resizew=166)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e828b8edf7a8f2cdcfceb13a4e05bf6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df8e2b4eda45e83f9f7dd51ec6e9ed17.png)
您最近一年使用:0次
2023-07-05更新
|
790次组卷
|
2卷引用:湖南省怀化市2022-2023学年高一下学期期末数学试题