21-22高一上·浙江·期末
1 . 下列判断正确的有( )
A.![]() | B.![]() |
C.若![]() ![]() | D.![]() |
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20-21高一·江苏·课后作业
名校
2 . 如图,
为梯形,其中
,
,设O为对角线的交点.
表示平行于两底且与它们等距离的线段(即梯形的中位线),
表示平行于两底且使梯形
与梯形
相似的线段,
表示平行于两底且过点O的线段,
表示平行于两底且将梯形
分为面积相等的两个梯形的线段.
,
,
,
与代数式
,
,
,
之间的关系,并据此推测它们之间的一个大小关系.你能用基本不等式证明所得到的猜测吗?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/520f8abda6a85e7ef6f281fc2df853fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d42e97eee705d164e6ac6de9ecd6d1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb0786732df29e599cd67cd69e5a1a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae57e49b519bb89ea02274318a34438d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37d9a39b4dab211a19ee2950a93c7049.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59000198fc5779f7ecf141860ff08a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/520f8abda6a85e7ef6f281fc2df853fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae57e49b519bb89ea02274318a34438d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.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/5b4dda7369edf57a39cfad583031328a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dc8b26fb79c1f4d36130c41b18c0f9c.png)
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2021-10-30更新
|
248次组卷
|
5卷引用:第二章 一元二次函数、方程和不等式(压轴必刷30题4种题型专项训练)-【满分全攻略】(人教A版2019必修第一册)
(已下线)第二章 一元二次函数、方程和不等式(压轴必刷30题4种题型专项训练)-【满分全攻略】(人教A版2019必修第一册)苏教版(2019)必修第一册课本习题第3章复习题(已下线)第三章本章回顾江苏省连云港高级中学2023-2024学年高一上学期第一次学情检测数学试题湖北省荆门市东宝中学2023-2024学年高一上学期期中数学试题
解题方法
3 . 《几何原本》中的几何代数法是指用几何方法研究代数问题,很多代数定理都能够通过图形实现证明,这种方法被称为“无字证明”.如图,点
在半圆
上,
于
(点
不同于
,
,
),且
于
,设
,
,请写出一个可以通过此图形实现“无字证明”的不等式:______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1932b7eba41cc74bd9e63fa0558277d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5228da61bed106b28849ef91a2ec116.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc490fd9c850622aa2beaf5d38d46459.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/eaec6b46-06de-4978-a68d-936cda253150.png?resizew=155)
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解题方法
4 . (1)设x,y为正数,
,证明
;
(2)x,
,
,求证:对于任意正整数n,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5558c083d34cbb0a58d3ce1dc6f5778e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b344a55415f511aa8f43d47684bb050f.png)
(2)x,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/061813f1ec633c5c4c393c4de7938322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5558c083d34cbb0a58d3ce1dc6f5778e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7534520ae43c10f7b1b48168ee527315.png)
您最近一年使用:0次