名校
1 . 已知n元有限集
(
,
),若
,则称集合A为“n元和谐集”.
(1)写出一个“二元和谐集”(无需写计算过程);
(2)若正数集
是“二元和谐集”,试证明:元素
,
中至少有一个大于2;
(3)是否存在集合中元素均为正整数的“三元和谐集”?如果有,有几个?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb9e56ab45ddf991ae24983027e04b08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bf910f82c3094b267a3d481d23d829f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a886e3d7d448ea2f360c6160c087fec6.png)
(1)写出一个“二元和谐集”(无需写计算过程);
(2)若正数集
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6a419b26f7e9c3325eb115189a1519f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
(3)是否存在集合中元素均为正整数的“三元和谐集”?如果有,有几个?请说明理由.
您最近一年使用:0次
2023-10-25更新
|
165次组卷
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2卷引用:河南省新乡市原阳县第一高级中学2023-2024学年高一上学期10月月考数学试题
名校
2 . 若集合A具有①
,
,②若
,则
,且
时,
这两条性质,则称集合A是“好集”.
(1)分别判断集合
,有理数集Q是否是“好集”,并说明理由.
(2)设集合A是“好集”,求证:若
,则
.
(3)对任意的一个“好集”A,判断命题“若
,
,则
”的真假,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2faf3937abcb6a59071c17bc6bb10f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35a2410ce34b36954ed4923e600d42f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e13a814f8e081078dcf3788177affcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c46de01c5104b9112a688df37eadb000.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38f0e9c04402a0ffdaa25c3e3c82c7dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cd77104cc745d1e0e262122da34482d.png)
(1)分别判断集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9720fd3e90e0f5dedc985310efea84e4.png)
(2)设集合A是“好集”,求证:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e13a814f8e081078dcf3788177affcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/957d41dbe52b49c3a7339e3519a3fe84.png)
(3)对任意的一个“好集”A,判断命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e63c91626ffa91e590925e6f206c3c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae4f0ccdfc1206d809e581449d0452e.png)
您最近一年使用:0次
名校
3 . 设集合
,若集合S中的元素同时满足以下条件:
①
,
恰好都含有3个元素;
②
,
,
为单元素集合;
③![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f5e5858ed377ffaf700c868a38e7256.png)
则称集合S为“优选集”.
(1)判断集合
,
是否为“优选集”;
(2)证明:若集合S为“优选集”,则
,
至多属于S中的三个集合;
(3)若集合S为“优选集”,求集合S的元素个数的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c32fe32077f54b51282141c6f6217071.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/296902bfc14bde752a4503d57351988a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e819b87f90651d89fcd258c276294e43.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866fcccdcf1d7bf2f73d4323b4c1c1e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b71af6590f0f369c164a054a8b63bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d41e1766af890659ac91f4ed407f5a0f.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f5e5858ed377ffaf700c868a38e7256.png)
则称集合S为“优选集”.
(1)判断集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d7d06d943bfb67f20183899803ef150.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a839a1d941f18f084505c7e8614c984b.png)
(2)证明:若集合S为“优选集”,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7060f36f24efe532ddd3f12084f36d83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)若集合S为“优选集”,求集合S的元素个数的最大值.
您最近一年使用:0次
2023-01-19更新
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567次组卷
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4卷引用:河南省周口市周口恒大中学2023-2024学年高一上学期9月月考数学试题
河南省周口市周口恒大中学2023-2024学年高一上学期9月月考数学试题重庆市南开中学校2023-2024学年高一上学期九月测试数学试题(已下线)难关必刷01集合的综合问题(3种题型40题专项训练)-【满分全攻略】(人教A版2019必修第一册)北京交通大学附属中学2021-2022学年高一上学期期中数学试题
名校
4 . 设
是一个非空集合,由
的一切子集(包括
,
自身)为元素构成的集合,称为
的幂集,记为
.
(1)当
时,写出
;
(2)证明:对任意集合
,都满足
;
(3)设
是
个两位数字形成的集合,证明:
中必有两个
的子集,其元素的数值和相等.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29c4b9c60fdb001f63be75985dce0615.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29c4b9c60fdb001f63be75985dce0615.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f1677491ba90508b0e815b566447a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29c4b9c60fdb001f63be75985dce0615.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29c4b9c60fdb001f63be75985dce0615.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e97dd472fe7779d5c729aa8dedd99190.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7549990c248033f634d6b243b1b2dfff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e97dd472fe7779d5c729aa8dedd99190.png)
(2)证明:对任意集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac6fcd46d3cf19bb064958759ff2b3a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/580756dffbc89ae37acef0f48d5c1140.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29c4b9c60fdb001f63be75985dce0615.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e044325ad7fdaef36758daa8b9fe4456.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e97dd472fe7779d5c729aa8dedd99190.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29c4b9c60fdb001f63be75985dce0615.png)
您最近一年使用:0次
2022-10-21更新
|
147次组卷
|
2卷引用:河南省周口市川汇区周口恒大中学2023-2024学年高一上学期期中数学试题