1 . 如果一个非空集合
上定义了一个运算
,满足如下性质,则称
关于运算
构成一个群.
(1) 封闭性,即对于任意的
,有
;
(2) 结合律,即对于任意的
,有
;
(3) 对于任意的
,方程
与
在
中都有解.
例如,整数集
关于整数的加法(
)构成群,因为任意两个整数的和还是整数,且满足加法结合律,对于任意的![](https://staticzujuan.xkw.com/quesimg/Upload/formula/526c6e33166cdaadce9d0226b67642c7.png)
,方程
与
都有整数解;而实数集
关于实数的乘法(
)不构成群,因为方程
没有实数解.
以下关于“群”的真命题有( )
①自然数集
关于自然数的加法(
)构成群;
②有理数集
关于有理数的乘法(
)构成群;
③平面向量集关于向量的数量积(
)构成群;
④复数集
关于复数的加法(
)构成群.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fd94e5c210921dfbe11796b1fc97cee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fd94e5c210921dfbe11796b1fc97cee.png)
(1) 封闭性,即对于任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c9cbad1e8b405feac6e8fe403f024b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d114f63ee7e47c04170f88f50da421fb.png)
(2) 结合律,即对于任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d4ef2c168b3dba086f2485c3c9cc7c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f85669796a75bc41a4c73d983df4e470.png)
(3) 对于任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c9cbad1e8b405feac6e8fe403f024b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a2f15046971cccda1b8d71b6619a4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/592d41e37ffe434aa96117acdeef06ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
例如,整数集
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ed24e42ca43303878d653316e149170.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d4cd9a7068de096606d1ab991f5e6da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/526c6e33166cdaadce9d0226b67642c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ed24e42ca43303878d653316e149170.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/333b4fe0a74ea21932b6954c63b3c794.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ea1301a10396933e82b070621bacbef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2628e2dd7a988cc80530e739c22b2280.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2468403b3eba9e40bfa36f464e927738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/086adfb67fd14ad6b4acdf96d1b65449.png)
以下关于“群”的真命题有( )
①自然数集
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d6e5e4edd3db682d6f0e57aca5e4d43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d4cd9a7068de096606d1ab991f5e6da.png)
②有理数集
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2a064c152c8d7225a1cf14a247f2ce4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2468403b3eba9e40bfa36f464e927738.png)
③平面向量集关于向量的数量积(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c97ec04a1aa7ac6fce72d589864940a2.png)
④复数集
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/616bf4b8ecad92ea0d882024ef56bb37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d4cd9a7068de096606d1ab991f5e6da.png)
A.0个; | B.1个; | C.2个; | D.3个. |
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2 . 中国国旗上所有颜色组成的集合为________ .
您最近一年使用:0次
名校
3 . 设全集
,
.
(1)若
,求
,
;
(2)若“
”是“
”的充分不必要条件,求实数a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7aa1ec49b823d918a0463e70716329e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/480f0b74515ef6ca0be6e1858631c285.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fdbfa7a63fdf5717d40c8c9a73ec160.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3c874c8c93433c69412eebc122389bb.png)
(2)若“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e23af61cd402b3789af2401bde9cbefe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ed006b944ea64f970fee46e2f558467.png)
您最近一年使用:0次
名校
解题方法
4 . 设集合
,
,则
,则实数a的取值范围为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8a6a9c23abe51588bafed01c973cbe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3acc772ee28146140a5ebe794a4f1ed1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d7f14bf7f60fe19b509223284455f05.png)
您最近一年使用:0次
2024-01-20更新
|
1518次组卷
|
6卷引用:上海市新中高级中学2024届高三上学期10月阶段检测数学试题
上海市新中高级中学2024届高三上学期10月阶段检测数学试题(已下线)【一题多变】集合含参 关系运算(已下线)考点2 集合运算 --2024届高考数学考点总动员【练】(已下线)黄金卷03(2024新题型)2024届河北省承德市部分高中二模数学试题河北省衡水市部分学校2024届高三下学期二模考试数学试题
名校
5 . 已知集合
,集合
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4b9b470218359a4a47be9244980489e.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16e8d171c3d2d86dc5594cffb51096fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d83ac065c29bbb0830f61d3a693e7c45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4b9b470218359a4a47be9244980489e.png)
您最近一年使用:0次
2023-11-18更新
|
255次组卷
|
2卷引用:上海市静安区风华中学2024届高三上学期11月月考数学试题
名校
6 . 设全集
,若集合
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2143cff1201a49034668264e48d1e17.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa26ede4564b80c035c146272384bf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f873d05efd2bca4231b99f7e770ce7e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2143cff1201a49034668264e48d1e17.png)
您最近一年使用:0次
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解题方法
7 . 已知集合
,常数
,
.
(1)当
时,求
;
(2)若
是
的必要非充分条件,求实数a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25c2614e21e865e481b2c58f7fd07322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a82eb7e2b7a60d7a984e4e1e647214f7.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3744e71abf4b43e128eabea9181b712.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ed006b944ea64f970fee46e2f558467.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e23af61cd402b3789af2401bde9cbefe.png)
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8 . 方程
的解集为____________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8365d65fa051a16da0c24f2c9ee558c8.png)
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9 . 已知集合
,若
,则实数
=________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ea144c0f0680978aed6d0a7f72306c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e11512d75a4a53cbb9b4e619cf7d15ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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解题方法
10 . 集合
,
,
,则实数
的取值集合为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b89ff0e4b96b54d68d4826157147b13a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc2b18b7ff7bc6123773914065dbd111.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9d0d79fd0efdb59c9ca65bfae4a0861.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次