1 . 用适当的方法证明下列命题,求证:
(1)
;(
)
(2)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/840ab5202c0dd51fb0d9aa14a500fd45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3eb9b6fe8959ae9e71e857b6d6fed49.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/734f585f8cfc92522f6daf997ebec04d.png)
您最近一年使用:0次
2021-10-03更新
|
805次组卷
|
5卷引用:新疆新源县2020-2021学年高二下学期期末数学(文)试题
解题方法
2 . (1)证明:
;
(2)已知:
,
,且
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/734f585f8cfc92522f6daf997ebec04d.png)
(2)已知:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/061813f1ec633c5c4c393c4de7938322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adf913c92060a7bad4de1ee8c04d011e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94752276c75f22d290087179226d450f.png)
您最近一年使用:0次
3 . 用综合法或分析法证明:
(1)已知三角形
中,边
的中点为D,求证:向量
.
(2)已知
,且
,求证:
.
(1)已知三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9463202b5ad3002b982ccf5809854e80.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce613eaa5df46a50174085ef5d1087fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e56f4504e0f80fd031c8b5f41832e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8954db00a1de8263871cf3e26965eb4b.png)
您最近一年使用:0次
4 . 按照要求证明下列不等式.
(1)已知
,用综合法证明:
;
(2)用分析法证明:
.
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c4c098615c6bc7e6dcf72e5b5201a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb54b1b3617ebc502cb44194cbcd1dc.png)
(2)用分析法证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ceed227c026ff8d94237c63ace92cf78.png)
您最近一年使用:0次
解题方法
5 . (1) 用分析法证明:
+
>
+
;
(2)证明:如果a,b>0,则lg
≥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a68c1d20a422a363e356a160f096503c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50690dab38f4512eb72e18b7f86cf6f6.png)
(2)证明:如果a,b>0,则lg
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2f89a8b5cf6996a6455375e405bfb9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/811bf05cb58bb23374927ea8a1f24530.png)
您最近一年使用:0次
6 . 设
是由
个实数组成的
行
列的数表,满足:每个数的绝对值是1,且所有数的和是非负数,则称数表
是“
阶非负数表”.
数表![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
数表![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
(1)判断数表
,
是否是“4阶非负数表”;
(2)对于任意“5阶非负数表”
,记
为
的第
行各数之和
,证明:存在
,使得
;
(3)当
时,证明:对与任意“
阶非负数表”
,均存在
行
列,使得这
行
列交叉处的
个数之和不小于
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e051d6741baa97223f604c4e99e6188.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
数表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
1 | 1 | -1 | -1 |
1 | 1 | -1 | -1 |
1 | -1 | 1 | -1 |
1 | 1 | -1 | -1 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
-1 | -1 | -1 | -1 |
1 | 1 | 1 | -1 |
1 | -1 | 1 | -1 |
1 | 1 | -1 | -1 |
(1)判断数表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
(2)对于任意“5阶非负数表”
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423775a9e309003c524bb212031aae09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2db14a5f7b205a7de85c513e03122f06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d9755ec6931b6420aab2bbc1d635f59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe31c7055d29454c0acb89a2ef9f0414.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b978a2d5bdd1224ac803fe95197896d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b986e3613290b456532843d5ad4c6e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次
7 . (1)设
,证明:
;
(2)已知
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ada798eeba5bd19d497bfd0741afd00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bd481b8e7e428a49b41b43ec744fcb5.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9185519a1b1928d6cd4147f43c738145.png)
您最近一年使用:0次
2020-04-30更新
|
470次组卷
|
3卷引用:甘肃省白银市会宁县第一中学2020-2021学年高二下学期期末数学(文科)试题