名校
1 . 设集合
,称坐标
在平面直角坐标系中对应的点P为A中元素a的格点.
(1)证明:若
则
.
(2)A中的元素
所对应的格点记作
(
),现将A中所有元素进行排序,使得
,在平面直角坐标系中,求以
为顶点的三角形面积.
(3)已知集合
,若
至少有2个元素,最多有5个元素,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/799adb7e4c8ebf9a30182e46e56f3192.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0203b006524305c3d8ee0b6c34cd872b.png)
(1)证明:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91cc05fe570763e4af0ff4672e2d09e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ae4202aa738ce97198687198555c84c.png)
(2)A中的元素
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f255d0395fba51ca2d44293cca42e0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf99487d7860d017c0747ff966edfd77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/019123b8c298384939e99ef5e37720d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c8c195da3f1e6e13cc9fc7aca43e17d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4a0c3c4114915039e38b671bb707c09.png)
(3)已知集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63728e5600559674a6bb03a0f183007e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fdbfa7a63fdf5717d40c8c9a73ec160.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
您最近一年使用:0次
2023-10-07更新
|
201次组卷
|
2卷引用:江苏省连云港市灌南高级中学2023-2024学年高一上学期第一次月考数学试题
名校
2 . 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
|
170次组卷
|
2卷引用:安徽铜陵市第一中学2023-2024学年高一上学期10月月考数学试题
名校
3 . 已知
为所有
元有序数组
所组成的集合.其中
(
).
对于
中的任意元素
,
定义
,
的距离:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1138a3e79624a1fe9bc03b5300d9483.png)
若
,
为
的子集,且有
个元素,并且满足任意
,都存在唯一的
,使得
,则称
为“好
集”.
(1)若
,
,
,
,
,
,求
,
及
的值;
(2)当
时,求证:存在“好
集”,且“好
集”中不同元素的距离为5;
(3)求证:当
时,“好
集”不存在.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97de4e0337716e1d89eb1a6cfd7b8335.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a406d53fd6ffd9ee6cd914f5e2b0a9bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ab46d077ba3d6e13fa1f6a5aaa0ce6b.png)
对于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f94a179746b8c763e5620ac724ff1147.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44f2d8a263129fd9df23224bcd54d25e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1138a3e79624a1fe9bc03b5300d9483.png)
若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83a6bc55d5eb2c3d085b62ffcd8d138d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b52b4f24969673c863b5aff4fb6751ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d0dce56f4a3a33c63f59cb4e79fdd4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98aa5f1acb67ec4580d240c2525e4d5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26ff114e0ec7de68f1239f70f68152b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbd7ef0582648cdadc44efeff970f349.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b733d1c7e28ba1380d76ef991a0e896e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b52b4f24969673c863b5aff4fb6751ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(1)若
![](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/45b339e4303d066bc297c22b72ecb324.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4f945af9e01c29c5b3a8da1d640e910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e3bf525a4089739d372536e76d625d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e753949e45a5c315b622a27cb22138dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0ea1cb8084df487fa8b6d1956c6e8af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f10adb388c64ee1f164269219d9afc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c93bd6883272a1c27f8a04f5901fc63.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5095a28bb1b91bf6bed9e2cfbd76bb18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(3)求证:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc329b32ecf0f0532d09a8a21343e8cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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名校
解题方法
4 . 已知
元正整数集合
满足:
,且对任意
,都有![](https://staticzujuan.xkw.com/quesimg/Upload/formula/453e81d3dacb5e2e527b8daebcf19fc9.png)
(1)若
,写出所有满足条件的集合
;
(2)若
恰有
个正约数,求证:
;
(3)求证:对任意的
,都有
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5fcfc55b56f04ac530871067e5ce71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b5ba5a3d48da1d7f3952c013a5ee0de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/139ae1c18e2cded6d04808a3aa24c6bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26c7cb34e9b5c1ecd75ff1966e882ae7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/453e81d3dacb5e2e527b8daebcf19fc9.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7334c46af837676ada9575630a48d60f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7979eac1b85b681ba94bf8d833c5c6e7.png)
(3)求证:对任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fa673986cef1873a421a572abf9ed71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57cee7a77f2f4592cb5c96245ff025f8.png)
您最近一年使用:0次
5 . 如图,T是3行3列的数表,用
表示位于第i行第j列的数,且满足
.
数表中有公共边的两项称为相邻项,例如上表中
的相邻项仅有
和
.对于数表T,定义操作
为将该数表中的
以及
的相邻项从x变为
,其他项不变,并将操作的结果记为
.已知数表
满足
.记变换
为n个连续的上述操作,即
,使得
,并记![](https://staticzujuan.xkw.com/quesimg/Upload/formula/940b6ad493a154f53cd16407400553db.png)
(1)给定变换
,直接写出
.
(2)若
满足
,其他项均为0.
是含n次操作的变换且有
,求n的最小值.
(3)若变换
中每个操作
至多只出现一次,则称变换
是一个“优变换”,证明:任给一个数表
,存在唯一的一个“优变换”
,使得
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a24eb6de41efa7648c4b49958c8c6a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb5ee774243d2ec9dd07c5649f330aaa.png)
![]() | ![]() | ![]() |
![]() | ![]() | ![]() |
![]() | ![]() | ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e84c30444f13d37ada78285dc4f83b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e76d1d8e50dda4d50229a8a20c57e58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b73b9f587b1893d4c1971297dd44bcf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c18d60331b2ccaaca096f7026e1ba6f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37a14c188b1c9d61aa237b137ba18023.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37a14c188b1c9d61aa237b137ba18023.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/473cde34d30af32e391194ae7cf58754.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b98dd5c7e9a849194d21ee2f062586.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/635ccd929471d564cc9d2d96266b34d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6037ba46229c9c395dcf599bdb6cf87e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8f930d5d9e87b19a531a6d9a215d15a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b84ce3a837151a58e53f29dd531de5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bddfd31a3de7deb2b6ff78a69698e19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/940b6ad493a154f53cd16407400553db.png)
(1)给定变换
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97b9c1bd109316c0aa324fe5611966cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f1475725a072d4a360d6eb849561910.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a03f28098e4a70ed5d886f053da7f648.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dedc676bee9dc9c8f362c6973f683aec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8f930d5d9e87b19a531a6d9a215d15a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eea68c8748cf156803e34648f445690f.png)
(3)若变换
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8f930d5d9e87b19a531a6d9a215d15a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c18d60331b2ccaaca096f7026e1ba6f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8f930d5d9e87b19a531a6d9a215d15a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b56888f1c0e1f8434b6f08b166aa5d6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8f930d5d9e87b19a531a6d9a215d15a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e43d635a604b4e3ee6ec9bec108b992e.png)
您最近一年使用:0次
6 . 当
时,定义运算
:当
时,
;当
时,
;当
或
时,
;当
时,
;当
时,
.
(1)计算
;
(2)证明,“
或
”是“
”的充要条件.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9b8043346a0a80781b0d9a7c9cecd4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e16415b61722f9961e412386e6819f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a28f616b1f56991ee75caae3ac35208b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a05cb3647f1ad81e328f8379b51291b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6910a71dc1e164c35b110ad0d68e3f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e9e3cf30d7a15408ddd0697a1fcf3d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c4aa46e2bdec36770ee57fe67639ac2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4581917005539a0806619080496676e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b85349216e2fbdaa860e9f81b3924af3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd876a2ed79c64bacc3e64b8ee92735e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987270ce2ca977277b0a3d13cb20a9b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfd09fb9482124fd35f19b86894648f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb01e9ee38d5b6ab84c19789cb5af195.png)
(1)计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2a26d77e8c7e6ffc9ea9b9ed6d813a1.png)
(2)证明,“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80d05a5b738133c7204d1c8f90e30ba8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edfc50db0551c95ea1c63550750db33b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10ffb9194dead5975e453628f5bac1e7.png)
您最近一年使用:0次
名校
7 . 定义一个n元数组
,其中
或1,i、
﹐设
,
表示A和B中相应的元素不同的个数(例如,
,则
).
(1)若
,写出所有满足
的5元数组B;
(2)设
,记
的5元数组B的个数为
,求
的值;
(3)令
(n个0),
,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/386216116ecf49be4a0ebdddacec60bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a70ee9f169cd7e6d36ddc301f2653498.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f436426be5f021a8eebccc2298b6dea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce3b807eb2c7de7ec3a9bcf888b5caff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1411bda8a6dee80bb6387471cfe945bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/092c1c15b9dfe25f62c33a23c63b9df7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05ece890a7ada4782024dea0f592c14a.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58aa6b0d8f54fa4ba22615db58834fc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02b44b19e29782883ea7a17ed0684154.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab88e3c1464bf1ec790168779faced2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59ce4001c7467ac929dd94288f6bce09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/545e6bd700ba1c9217f2c2598b459d4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c94707f5af06686f6265f2fdaa69b85.png)
(3)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4e725c235172819de9751e908e63ff5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce3b807eb2c7de7ec3a9bcf888b5caff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f74fb4d2ac68691e607eb7c5cdf418ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5cc8f86e2046efa8b4f1dd5104b11c8.png)
您最近一年使用:0次
名校
8 . 给定正整数
,设集合
.对于集合
中的任意元素
和
,记
.设
,且集合
,对于
中任意元素
,若
则称
具有性质
.
(1)判断集合
是否具有性质
?说明理由;
(2)判断是否存在具有性质
的集合
,并加以证明;
(3)若集合
具有性质
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a839578f0b23c8aeba01730563a643e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9da8a33568ded09f3450bb153b0e5697.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/714ab9e5a6949c90c9bfdd118cfabeb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d35e477c52dfbfb80f1fc315143c8b06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1368a045ba80f97383f3d9d7fcdc8f15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cd94234d029d89c7b788b6d1e225db6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9855cb665c7f3785a17718be10538af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a2f08194bb663f1a086fa2f555ebf43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faa6d3ee76dcca88508ec0921f1adf0f.png)
(1)判断集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbd6650ab1ac1f7426ec68c729671c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c581b105a7e14eae97d650ae73adf710.png)
(2)判断是否存在具有性质
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a742b9bb0812b7bb895851cc5a06fa1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(3)若集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faa6d3ee76dcca88508ec0921f1adf0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b74258d0a66cadc32ba68697abca894.png)
您最近一年使用:0次
2023-03-27更新
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1991次组卷
|
13卷引用:北京市海淀区首都师范大学附属中学2024届高三上学期10月阶段检测数学试题
北京市海淀区首都师范大学附属中学2024届高三上学期10月阶段检测数学试题北京市西城区2023届高三一模数学试题专题12压轴题汇总(10、15、21题)专题01集合与常用逻辑北京市人大附中2022-2023学年高一下学期期中模拟数学试题(已下线)北京市丰台区2023届高三下学期3月一模数学试题变式题16-21北京卷专题02集合(解答题)(已下线)北京市第四中学2022~2023学年高一下学期期中数学试题(已下线)单元高难问题01集合中的新定义问题-【倍速学习法】(人教A版2019必修第一册)(已下线)专题03集合的运算-【倍速学习法】(人教A版2019必修第一册)北京市中关村中学2023-2024学年高二上学期期中练习数学试题(已下线)广东省深圳中学2023-2024学年高三寒假开学适用性考试数学试题(已下线)高三数学临考冲刺原创卷(二)
名校
解题方法
9 . 对于实数构成的集合
.若对任意
都有
(其中“
”表示普通的乘法运算),则称集合
对“
”是封闭的.
(1)已知集合
,判断
是否属于集合
;
(2)在(1)的条件下,若
,证明
的充要条件是
;
(3)若集合
对“
”都是封闭的,试判断
是否对“
”封闭,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cffa35373ec4e4684107b42adb7a5161.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8af42f2ec410ad1b28be69d3415ed10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a9f1ff137e76626b7b608cef7c36349.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2468403b3eba9e40bfa36f464e927738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cffa35373ec4e4684107b42adb7a5161.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2468403b3eba9e40bfa36f464e927738.png)
(1)已知集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50dae68b646f975a8a0c6bed67d028ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e57ed82958abb00776e75987aa62d723.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)在(1)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9ecef225b27b5857d2d76fbe5b34982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caf22d7d1a965bda25168a233fb6290c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bff58fdfe14af9fb8aa0e0cf0d60853a.png)
(3)若集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2468403b3eba9e40bfa36f464e927738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81a3375139541ed61929fa658f16bb7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2468403b3eba9e40bfa36f464e927738.png)
您最近一年使用:0次
名校
解题方法
10 . 设集合A的元素都是正整数,满足如下条件:①A的元素个数不小于3;②若
,则
的所有因数都属于A;③若
,
,
,则
,请回答下面的问题:
(1)证明:1,2,3,4,5都是集合A的元素
(2)判断2021是否集合A的元素,并说明理由
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cc020b0997a2f37b214718112b79d8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cc020b0997a2f37b214718112b79d8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb9df3a17aa370eba2add2c13cfc2619.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63478e7cf55bad51bbd4ce1e23363e75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bad767600de4c7c7d2fa23bd2c2813f.png)
(1)证明:1,2,3,4,5都是集合A的元素
(2)判断2021是否集合A的元素,并说明理由
您最近一年使用:0次