2022高三·全国·专题练习
1 . 设
,
,比较
与
的大小.
![](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/78d58fcb289c7a79f5ce11f912007d2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a989c4fbf0ff34cedb365d2dda47f16.png)
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2 . 设0<a<b,a+b=1,则下列不等式正确的是( )
A.b<2ab<![]() | B.2ab<b<a2+b2<![]() |
C.2ab<a2+b2<b<![]() | D.2ab<a2+b2<![]() |
您最近一年使用:0次
3 . 已知
,
,
都是正数,且
.
(1)若
,求函数
的最小值;
(2)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/751e274e9107d780c39ba9c49d6daefb.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b05d3b8f5c9df891ef6fbcaf12f43207.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e2b7ec0abbdc79dc6a9c4be71c5de9.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a3cfe361051dc5e9a3a36b2818db0.png)
您最近一年使用:0次
2022-11-20更新
|
89次组卷
|
2卷引用:中学生标准学术能力诊断性测试2022-2023学年高三上学期11月测试文科数学试题
4 . 若正数x,y满足x+3y=5xy,则3x+4y的最小值是
A.![]() | B.5 | C.![]() | D.6 |
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解题方法
5 . 对于问题“已知正实数x、y满足
,求
的最小值”,申辉中学的小刚给出了一个解答:
因为
,所以
的最小值为
.
问:他的解答过程是否正确?判断并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54ad6ad6348d983eabf87ffb4163068f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b88584cf1df43e28d03592c7998b1653.png)
因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ef8a3bd7efae3a1d8091a75b07fe9c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b88584cf1df43e28d03592c7998b1653.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2be0800a0157a63340c353f47b5fe715.png)
问:他的解答过程是否正确?判断并说明理由.
您最近一年使用:0次
2021-11-20更新
|
139次组卷
|
2卷引用:沪教版(2020) 必修第一册 达标检测 第二章 2.3 基本不等式及其应用
20-21高一·江苏·课后作业
6 . 计算下列两个数的算术平均数与几何平均数(其中
):
(1)2,8;
(2)3,12;
(3)p,
;
(4)2,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5abd313d4e92a762fb7fb0c1cb65263d.png)
(1)2,8;
(2)3,12;
(3)p,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07d588b8333c14c140bc7617f7abafc3.png)
(4)2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a80b9f2e6c688236d68b3fc93ae65af8.png)
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7 . 已知
,
,且
,则
,
,
,
,
中最小的是( ).
![](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/2958030ec9d7543dda1f529593a915e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b4dda7369edf57a39cfad583031328a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2f89a8b5cf6996a6455375e405bfb9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78d7009d4cbe7157d63ce50444443716.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dc8b26fb79c1f4d36130c41b18c0f9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eafd0e253a0a62512d50c656de3dc2e9.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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21-22高一上·全国·课后作业
8 . 已知
为正数,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a73bc443b2610440a98ca9f2f18c549.png)
您最近一年使用:0次
9 . 已知
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846fed98a219097783e0ca2f41483cac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec7021a602971900f05ffc19aacdec4a.png)
您最近一年使用:0次
2020-02-04更新
|
218次组卷
|
2卷引用:人教B版(2019) 必修第一册 逆袭之路 第二章 等式与不等式 整合提升
解题方法
10 . 已知函数
的最小值为
;
(1)求函数
的解集;
(2)若
,
,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f6f0d97d03f9f90e22c5570664f5b74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/990d3feee85e869ea9ab561ff63d46a2.png)
(2)若
![](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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5c933aedd6c1d6ea6532d65e6ac78af.png)
您最近一年使用:0次
2020-07-22更新
|
218次组卷
|
3卷引用:百校联盟2020届高三教育教学质量监测理科数学试题