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解题方法
1 . (1)设
,求证:
;
(2)求证:当
时,
中至少有一个小于等于
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2684b72f9f38f5046c8ecd4280b7b14b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54d8bf9316bb1dfb0559333ce56b35a6.png)
(2)求证:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c98401885743a500968884098943bb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdd5136b1f0a1bc88db3edeab331291.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
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2 . 用反证法证明命题:“若
,则
或
”时,应假设____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e03719ead0e4cb1a03684bf9d02ced.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db2b74d89854116e411c089d053df053.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d462ed4ec22e8fe51f09eb30e8792532.png)
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3 . 用反证法证明命题“设
,则方程
与
至少有一个实根”时要做的假设是___ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73254f32b6da29ecc32df2e9f87a4c97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88ffc83b103ff29143b70ca14b44c37c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf7587601e702f09291a082ef1141b59.png)
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2022-11-08更新
|
121次组卷
|
2卷引用:上海市进才中学2022-2023学年高一上学期期中数学试题
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4 . 把1,2,…,10按任意次序排成一个圆圈.
(1)证明:一定可以找到三个相邻的数,它们的和不小于18;
(2)证明:一定可以找到三个相邻的数,它们的和不大于15.
(1)证明:一定可以找到三个相邻的数,它们的和不小于18;
(2)证明:一定可以找到三个相邻的数,它们的和不大于15.
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5 . 用反证法证明命题“若
,则
或
”时,先假设命题结论不成立,即假设________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87b1a55e9102b4ca56d9ed52eee8c161.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb0469b312798e19c24fe494d03fb0a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f61f3666f73b23408ceaff1502fe02fd.png)
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6 . 对于问题“设实数
满足
,证明:
,
,
中至少有一个不超过
”.甲、乙、丙三个同学都用反证法来证明,他们的解题思路分别如下:
甲同学:假设对于满足
的任意实数
,
,
,
都大于
.
再找出一组满足
但与“
,
,
都大于
”矛盾的
,从而证明原命题.
乙同学:假设存在满足
的实数
,
,
,
都大于
.
再证明所有满足
的
均与“
,
,
都大于
”矛盾,从而证明原命题.
丙同学:假设存在满足
的实数
,
,
,
都大于
.
再证明所有满足
的
均与“
,
,
都大于
”矛盾,从而证明原命题.那么,下列正确的选项为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f9223bc24df8d429d743692fff7c06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a13880b9454c5942f164d934b1834783.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/176400fc97133ee3a7bba932544318ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb00b6918dfb251c1a63acdc07464b92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
甲同学:假设对于满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f9223bc24df8d429d743692fff7c06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a13880b9454c5942f164d934b1834783.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/176400fc97133ee3a7bba932544318ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb00b6918dfb251c1a63acdc07464b92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
再找出一组满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f9223bc24df8d429d743692fff7c06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a13880b9454c5942f164d934b1834783.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/176400fc97133ee3a7bba932544318ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb00b6918dfb251c1a63acdc07464b92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
乙同学:假设存在满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f9223bc24df8d429d743692fff7c06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a13880b9454c5942f164d934b1834783.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/176400fc97133ee3a7bba932544318ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb00b6918dfb251c1a63acdc07464b92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
再证明所有满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f9223bc24df8d429d743692fff7c06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a13880b9454c5942f164d934b1834783.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/176400fc97133ee3a7bba932544318ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb00b6918dfb251c1a63acdc07464b92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
丙同学:假设存在满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dad69e399b3b4f68b777f6678c7ced7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a13880b9454c5942f164d934b1834783.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/176400fc97133ee3a7bba932544318ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb00b6918dfb251c1a63acdc07464b92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
再证明所有满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dad69e399b3b4f68b777f6678c7ced7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a13880b9454c5942f164d934b1834783.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/176400fc97133ee3a7bba932544318ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb00b6918dfb251c1a63acdc07464b92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
A.只有甲同学的解题思路正确 | B.只有乙同学的解题思路正确 |
C.只有丙同学的解题思路正确 | D.有两位同学的解题思路都正确 |
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2022-10-14更新
|
111次组卷
|
2卷引用:上海市浦东复旦附中分校2022-2023学年高一上学期10月月考数学试题
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7 . 用反证法证明命题“若
,则a,b中至少有一个不为0”成立时,假设正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a68dbd91d6de68b550a5745ecd461d9.png)
A.a,b中至少有一个为0 | B.a,b中至多有一个不为0 |
C.a,b都不为0 | D.a,b都为0 |
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2022-07-02更新
|
175次组卷
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4卷引用:上海市建平中学2023届高三上学期9月月考数学试题
8 . 记项数为10且每一项均为正整数的有穷数列{
}所构成的集合为A,若对于任意p、
,当
时都有
,则称集合A为“子列封闭集合”.
(1)若
,判断集合A是否为“子列封闭集合”,并说明理由;
(2)若数列{
}的最大项为
,且
,证明:集合A不为“子列封闭集合”;
(3)若数列{
}严格增,
且集合A为“子列封闭集合”,求数列{
}的通项公式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45a4986883c710b4c3693bb4704c55a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b6498d760af8e823bab06cf73d1b35e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/482d33ab769aa9f133101de842ad1156.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fad1d216575ca5572691e9b74732243.png)
(2)若数列{
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e35eeaabd951fb09b2926807da3685b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5a9fd038cb8e6324451cc15bfd6d3d.png)
(3)若数列{
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d175c6644e841a4430ef49a6e7bd6362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
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9 . 用反证法证明命题:“已知
、
,若
可被
整除,则
、
中至少有一个能被
整除”时,应反设_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d285a4c557fc9748105b62ccd94b7859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18f0281e6bbdbe08beeccb55adf84536.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f9f04cd2bc80c166d49031fe99e6717.png)
![](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/8f9f04cd2bc80c166d49031fe99e6717.png)
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2021-10-21更新
|
112次组卷
|
5卷引用:上海市华东师范大学附属周浦中学2020-2021学年高一上学期10月月考数学试题
10 . 设复数数列
满足:
,且对任意正整数n,均有:
.若复数
对应复平面的点为
,O为坐标原点.
(1)求
的面积;
(2)求
;
(3)证明:对任意正整数m,均有
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/078c417ea54a5065c1f72941b9e4b0be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b670aca396b96eaf2c553b1ca84486dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a383b03b4869ea984d58b8d87c35402.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/012d2d40a71783e79d67e7fbb01bc93a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8312ce4d9e9f0aff13e64d93fbea921e.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5927f1967a8f72e8fb887edb5023a921.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9fec8f8ce956e4621c34db6218ed072.png)
(3)证明:对任意正整数m,均有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea99696f6df9d98c2dcc87832002874.png)
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