名校
1 . 已知集合
具有性质
:对任意
,
(
),
与
至少一个属于
.
(1)分别判断集合
,与
是否具有性质
,并说明理由;
(2)证明:
;
(3)
具有性质
,当
时,求集合
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d45a296e38b585f04206530b9e53d36f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7600d2cfbdc6146db96cc545706004f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18db8b768e5060b3471415e4b55ac30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/059a6c5a965c335b8da05e697da2c7c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b13ee542834ccbb57fcc55b1680ca9db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(1)分别判断集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5b42882dd156f60b1bbcc394155ee88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d9bf9b7e8523d5cdca10de9ae70770e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2faf3937abcb6a59071c17bc6bb10f6.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d020cd453031ae9eede7961ec78f21a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18d8e8f821111de8075e5c3dfb22a5d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
您最近一年使用:0次
2022-11-08更新
|
309次组卷
|
3卷引用:上海市光明中学2022-2023学年高一上学期10月月考数学试题
名校
2 . 非空向量集合
,对于任意
,以及任意
,都有
,则称
为“
类集”,现有四个命题:
①若
为“
类集”,则集合
也是“
类集”;
②若
、
都是“
类集”,则
也是“
类集”;
③若
、
都是“
类集”,且至少有两个公共元素,则
也是“
类集”;
④若
、
都是“
类集”,则集合
也是“
类集”;
其中所有正确的命题是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e426a4e290d404c53f1100bb89c27ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b523669123ea5387c8b03ef8c2f0a8eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2d2919e5bd26b5e9be672a3ff7604cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ba69c6640d28ea585f068b24a107667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9840c08178c84ee12e319a0828eebb81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2646f41226f24960a6186dc7860ef45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b76d26b78e63683dfacf10d3da6d74d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/195e871b6fbe2f0d4e07d80b6759116f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
其中所有正确的命题是( )
A.①③ | B.①④ | C.①②④ | D.①③④ |
您最近一年使用:0次
名校
3 . 设整数
,集合
,定义
.
(1)当
时,写出
,
.
(2)若
,
,求
的值.
(3)若
,求
的元素个数的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/058bc67c46e1586e6e165c9fb2f24bec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34503f07f867041463b11e81d2df025e.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4fa7f541be676dee0b2f9ec7ad965db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/660218d6a08ed361ae2a79bf08c5490f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b1c36fef381c46735d5008cd0b8a177.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a784e0ba1c17aba6990123fe39b89114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af84d1eb893cba48fdfaa22e85404fe6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3eead98a7980470f3345ccaa8384b9b.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a8d8f086586cb8a7f0f61af40fdb756.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/660218d6a08ed361ae2a79bf08c5490f.png)
您最近一年使用:0次
解题方法
4 . 已知含有限个元素的集合
是正整数集的子集,且
中至少含有两个元素.若
是由
中的任意两个元素之和构成的集合,则称集合
是集合
的衍生集.
(1)当
时,写出集合
的衍生集
;
(2)若
是由4个正整数构成的集合,求其衍生集
的元素个数的最小值;
(3)判断是否存在5个正整数构成的集合
,使其衍生集
,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4af4744dbbca4fa3ea142e671910edc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(3)判断是否存在5个正整数构成的集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fd5de2ca77c90a27b7d530ebe596ac8.png)
您最近一年使用:0次
名校
5 . 设集合
中至少有两个元素,且S,T满足:
①对于任意
,若
,都有
;
②对于任意
,若
,则
.
(1)分别对
和
,求出对应的
;
(2)如果当S中恰有三个元素时,
中恰有4个元素,证明:S中最小的元素是1;
(3)如果S恰有4个元素,求
的元素个数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61fa126ff595fe6c0b42a31148d6fd65.png)
①对于任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c36aecba41f6f5ff0d46a29dccaaf01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a11a069688e4c797fcf527eab15afa82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8339eab9c659e50db86828b65f825e22.png)
②对于任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/566d386cbedb1c8750f4837633c2af64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a5abe56c019ac914e1fcde1865a747.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5718e9c8baa106b447f9fae23e730de.png)
(1)分别对
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1014d847a76d84feaa69d22f6c27e98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a47661e8894db3bc283922eaf4bfa711.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af500a4e28d6f5b38390b7642eb96ed5.png)
(2)如果当S中恰有三个元素时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af500a4e28d6f5b38390b7642eb96ed5.png)
(3)如果S恰有4个元素,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af500a4e28d6f5b38390b7642eb96ed5.png)
您最近一年使用:0次
2022-11-07更新
|
608次组卷
|
3卷引用:北京师范大学第二附属中学2023解高三上学期期中考试数学试题
名校
6 . 已知集合
,其中
,由
中的元素构成两个相应的集合:
,
.其中
是有序数对,集合
和
中的元素个数分别为
和
.若对于任意的
,总有
,则称集合
具有性质
.
(1)若
,写出相应的集合
和
,求对应的
和
的值.
(2)检验集合
与
是否具有性质
并对其中具有性质
的集合,写出相应的集合
和
.
(3)对任何具有性质
的集合
,证明
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8213c48030bc2cfa88da0f2a28aca2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d807832357bea22a266e63cbd7e678a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/976ed3659749e70adb41abe4030b6ef2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/604a1abd24826ba48fe69d714b1b16d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30277e0be448b4955903e81e8795e45d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cc020b0997a2f37b214718112b79d8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a2cacc52ffe015e828a4a5f2fe5ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a9e6ad1166c7625e63b80e75b2fb1d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(2)检验集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e565001c699e5e221ed616dd7be2bb83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0110544a65399ad66980adc3667b8b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
(3)对任何具有性质
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61d9e6e4377bd1c8807094a4f2da622b.png)
您最近一年使用:0次
7 . 已知U是非空数集,若非空集合A,B满足以下三个条件,则称
为集合U的一种真分拆,并规定
与
为集合U的同一种真分拆.
①
;
②
;
③A的元素个数不是A中的元素,B的元素个数不是B中的元素.
则集合
的真分拆的种数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41be4f4fbf21555f325caf280c392c00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41be4f4fbf21555f325caf280c392c00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7113de81db260e6666292f39b447b848.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dea9a4259cca10c1f5af28e621ebafd6.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7dcbd7f44645b8c707627ab0795e18b.png)
③A的元素个数不是A中的元素,B的元素个数不是B中的元素.
则集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c00a91af23e3106574947939ef35310.png)
A.4 | B.8 | C.10 | D.15 |
您最近一年使用:0次
名校
8 . 已知集合
.对于
,
,定义
;
;
与
之间的距离为
.
(1)当
时,设
,
,求
;
(2)(ⅰ)求证:若
,
,
,且
,使
,则
;
(ⅱ)设
,
,
,且
.是否一定
,使
?说明理由;
(3)记
.若
,
,且
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2157d65a1caf1618eade9605fe6b67be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53422543e9a9311416faf749bdda67b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec1a7c3713945abc4eca8485945abf32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/272114f7ca7b47d5217e070c599fa95c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cfaf6f0a8c604e3c71e3bba5b14f046.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/80ebc8c7e32c1b561a908a36cfa2cbb5.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45cf86650443d1b86c79b1e3edc7e5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30883b665662f06415441c2f8cb6cc0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192ab63501f301390f52caee86fb3804.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3bcb4828b16c8e845492f1a53ddd9a9.png)
(2)(ⅰ)求证:若
![](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/7bb4a7a0497abab7c78203fd08cdc12c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/559305e1e35d369f1d056bb4191a23aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a14234249447bcb6ea7c44050f1e846.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f58a4ab4ebd738133e9cd5319ff5e9.png)
(ⅱ)设
![](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/7bb4a7a0497abab7c78203fd08cdc12c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f58a4ab4ebd738133e9cd5319ff5e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/559305e1e35d369f1d056bb4191a23aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a14234249447bcb6ea7c44050f1e846.png)
(3)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18177867c9cc54f91c3f3a201bc5df1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4157faf44a79fc69b8d762cf305aae57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0255c80b8f7b359e63531c2167bafcab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3bcb4828b16c8e845492f1a53ddd9a9.png)
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9 . 设集合M为实数集
的非空子集.若对任意
,都有
,则称M为封闭集.有以下结论:
①
为封闭集;
②若M为封闭集,则一定有
;
③存在集合
,A不为封闭集;
④若M为封闭集,则满足
的任意集合T也是封闭集.
其中所有正确结论的序号是_________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a43b2faa4f81f32d94612dce724e772b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9661053f3ef4cfa926e5d5fd5c6555f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79160ca8e11553db3726c964128391d8.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dc7c5ef0912790990d8a3a92c037392.png)
②若M为封闭集,则一定有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca05074e5a317ae45d073962bdf74dbe.png)
③存在集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68f35f44faebcb0a893c1b156f085843.png)
④若M为封闭集,则满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3d79d977409a0f1c13270dd72185015.png)
其中所有正确结论的序号是
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10 . 已知集合
,设A是S的至少含有两个元素的子集,对于A中的任意两个不同的元素
,若
都不能整除
,则称集合A是S的“好子集”.
(1)分别判断数集
与
是否是集合S的“好子集”,并说明理由;
(2)证明:若A是S的“好子集”,则对于A中的任意两个不同的元素x,
,都有
;
(3)求集合S的“好子集”A所含元素个数的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c54730b349603779705381ecfaa3d114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd7f07dd4a224f90b28ca7d711e3efdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/059d6df06a5b85848dc4fa33327f8e07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b88584cf1df43e28d03592c7998b1653.png)
(1)分别判断数集
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef27cd09f4ecc055fd7e72b3b368e5df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c91edb18f49d6acc68a3d8d1a1be6a5b.png)
(2)证明:若A是S的“好子集”,则对于A中的任意两个不同的元素x,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ddc8b4ed2041296890090da616d49f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d4be7ed8ae7440b7b7efae8889cc510.png)
(3)求集合S的“好子集”A所含元素个数的最大值.
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