1 . 已知数列
的前
项和为
,且
.
(1)证明
是等差数列,并求
的通项公式.
(2)对任意正整数
,都有
,且存在常数
,使得
为定值
.设数列
满足
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c2a3ac4693f3ec59776987cb84acae.png)
(1)证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69eac3188eac59966a17e24fdccdda8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)对任意正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e5ce81da9e5a476fc572abc576be82c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1212d11093fa85bd4b54cc740c5cd4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92c10ccc7fbf827004e9043bab8070e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/909a8e77c286a4308e92fc1544fb3e69.png)
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解题方法
2 . (1)已知
,
,
是正实数,且
.求证:
.
(2)已知
,求证
的最小值为
.
![](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/751e274e9107d780c39ba9c49d6daefb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32a373fb904316b6dac93c0caded72e9.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/148b86b4d8386fb95b7181a0f21950b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
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3 . 对于三元基本不等式请猜想:设![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec197b8ab457cfee3d4733f3d7f8d6f3.png)
_________ ,当且仅当
时,等号成立(把横线补全).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec197b8ab457cfee3d4733f3d7f8d6f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44acc0ee22dc4b7750e8be825e7c1355.png)
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4 . 用分析法证明:已知
,且
求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9592180b3752b8ace79e7b92f98cec1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be97cd1c7111b654d87d8fbb63b6a84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2533c09d4efe229490a509902d812566.png)
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解题方法
5 . 设
,
,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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3卷引用:浙江省精诚联盟2021-2022学年高二下学期5月联考数学试题
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6 . 已知实数
,
,
.则下列不等式正确的是( )
![](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/5be97cd1c7111b654d87d8fbb63b6a84.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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3卷引用:吉林省吉林市第一中学2021-2022学年高二6月月考数学试题(理科创新班)
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解题方法
7 . (1)已知a,b,c,为不全相等的正数,求证:
.
(2)已知a,b,为正数且
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9e9e7e24abc8a3b0194d9b23bc51812.png)
(2)已知a,b,为正数且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be97cd1c7111b654d87d8fbb63b6a84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dc1e59f01204b055561902d521a9a72.png)
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3卷引用:河南师范大学附属中学2021-2022学年高二下学期3月月考数学理科试卷
河南师范大学附属中学2021-2022学年高二下学期3月月考数学理科试卷(已下线)第一次月考模拟检测卷【范围:集合、常用逻辑用语、不等式】 -【单元测试】2022-2023学年高一数学分层训练AB卷(北师大版2019必修第一册)四川省广安市育才学校2022-2023学年高一上学期10月月考数学试题
解题方法
8 . (1)已知a,b,c是不全相等的正数,求证:
;
(2)用反证法证明:若函数
在区间
上是增函数,则方程
在区间
上至多只有一个实数根.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9ab8d8a251e0ec8d0e21a8f2372ef78.png)
(2)用反证法证明:若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f030c36bb8786df88d401792062a4100.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86b92b70365c63607daecdc8deb73ecf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f030c36bb8786df88d401792062a4100.png)
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2022高三·全国·专题练习
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9 . 已知
,
,
,求证:
(1)
;
(2)
.
![](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/ef8b020a520a9ba93cc751c175a2903d.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be74ed666178c7642f73e406603783f6.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08496edc372d910c3c825ab9e2736008.png)
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解题方法
10 . 证明下列不等式:
(1)
;
(2)
(
).
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/734f585f8cfc92522f6daf997ebec04d.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/840ab5202c0dd51fb0d9aa14a500fd45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3eb9b6fe8959ae9e71e857b6d6fed49.png)
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