名校
1 . 证明下列各题:
(1)求证:
;
(2)用综合法或分析法证明:若
,则
.
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/add637eef4cd8802b4eb211aa4f6e572.png)
(2)用综合法或分析法证明:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf04fe8895c10624636a815d3d752975.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0da537e5284dc9786845fca39a9ca913.png)
您最近一年使用:0次
2 . (1)已知实数
满足
,求证:
.
(2)已知实数
满足
,用反证法证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2128a00f52af4427721f0ebba591daa.png)
(2)已知实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/127a0d8c1c7d15ed40ec4b8bca0ebdf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/485a2d99320384a0857b00ce9ab9e990.png)
您最近一年使用:0次
名校
解题方法
3 . 选用恰当的方法证明下列不等式
(1)证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/679e658fa5679ce73e1b5fdfe434b724.png)
(2)已知
,证明:
.
(3)已知a,b,c均为正实数,求证:若
,则
.
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/679e658fa5679ce73e1b5fdfe434b724.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73254f32b6da29ecc32df2e9f87a4c97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fa4f85f4d4f4bd9edaa8a964565ca1a.png)
(3)已知a,b,c均为正实数,求证:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a57e060f61f7efa54982bda67db483a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22d54c9eb01acfe09c34cb808326cc5e.png)
您最近一年使用:0次
4 . 用综合法或分析法证明以下问题:
(1)若
是互不相等的实数,且
,求证:
.
(2)已知
.求证:
.
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a14c388e1e2e5a2ff1ccf6caffbee0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baa4b450e9269a7ef67582e7359f0125.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27b2d4c175ae8fadf2da3078ec2904d4.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fd185d0e487fab58f8b0bfbb46e4ba7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba77de7002cfcd4ae007a3c8b813e3b0.png)
您最近一年使用:0次
2022-05-12更新
|
135次组卷
|
2卷引用:陕西省宝鸡市金台区2021-2022学年高二下学期期中理科数学试题
5 . 用综合法或分析法证明:
(1)如果
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd70f831f301205134280f6432c8f84d.png)
(2)求证
.
(1)如果
![](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/bd70f831f301205134280f6432c8f84d.png)
(2)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c7677985318eb222a2af0aef6e7dd28.png)
您最近一年使用:0次
6 . 请选择适当的方法证明下列结论:
(1)求证:
;
(2)已知
,求证:
.
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0c1d583e670dac4530bd57ac9118740.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c4c098615c6bc7e6dcf72e5b5201a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e10cc5dd849caccce37fe98a26c598.png)
您最近一年使用:0次
2022-04-02更新
|
510次组卷
|
4卷引用:河南省洛阳市强基联盟2021-2022学年高二下学期大联考数学(文)试题
7 . (1)求证:
;
(2)已知
,
,且
,用反证法证明:
和
中至少有一个小于2.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94b3d03b6098d2f3f30d213d830d6a84.png)
(2)已知
![](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/69bbd0aae5a4f6129fc78f88f662f092.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5360e1dce424ae202f4ca4e5b842499f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/361751a03c628b8ddb0952a7390f7810.png)
您最近一年使用:0次
2021-10-13更新
|
284次组卷
|
4卷引用:上海市奉贤中学2021-2022学年高一上学期10月月考数学试题
8 . 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
9 . (1)证明:
,对所有实数
均成立,并求等号成立时
的取值范围.
(2)求证:
是无理数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f4e87bd6addd7ad01e563856c068e34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8242dce48218efc02663b59905fb7df.png)
您最近一年使用:0次
10 . 对于正整数集合A={a1,a2,…,an}(n∈N*,n≥3),如果去掉其中任意一元素ai(i=1,2,…,n)之后,剩余的所有元素组成的集合都能分为两个交集为空集的集合,且这两个集合的所有元素之和相等,就称集合A为“平衡集”.
(Ⅰ)判断集合Q={1,3,5,7,9}是否是“平衡集”并说明理由;
(Ⅱ)求证:若集合A是“平衡集”,则集合A中元素的奇偶性都相同;
(Ⅲ)证明:四元集合A={a1,a2,a3,a4},其中,a1<a2<a3<a4不可能是“平衡集”.
(Ⅰ)判断集合Q={1,3,5,7,9}是否是“平衡集”并说明理由;
(Ⅱ)求证:若集合A是“平衡集”,则集合A中元素的奇偶性都相同;
(Ⅲ)证明:四元集合A={a1,a2,a3,a4},其中,a1<a2<a3<a4不可能是“平衡集”.
您最近一年使用:0次
2021-10-24更新
|
282次组卷
|
2卷引用:北京市顺义牛栏山第一中学2020-2021学年高二上学期期中数学试题