1 . 如果有限数列
满足
,则称其为“对称数列”,设
是项数为
的“对称数列”,其中
是首项为50,公差为
的等差数列,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7104e10aa92b7fd3eb4e497263186664.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee9c7ca05f338a50f570dee17157774d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235d8a60ff374bd4c152852a5101b1a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3edbd40e04e2a943051fa83d6e511add.png)
A.若![]() ![]() |
B.若![]() ![]() |
C.当![]() ![]() |
D.![]() |
您最近一年使用:0次
2023-04-16更新
|
803次组卷
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2卷引用:辽宁省锦州市2023届高三二模数学试题
解题方法
2 . 今年以来,人们的出行需求持续释放,各种旅游项目态势火爆,旅游预订人数也开始增多.某调查组对400名不同年龄段的游客进行了问卷调查,其中有200名游客进行了预订,这200名游客中各年龄段所占百分比如图所示:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/17/567cf388-74d2-4148-91f8-88e1cbacb7b0.png?resizew=138)
年龄在19-35岁的人群称为青年人群,已知在所有调查游客中随机抽取1人,抽到不预订的青年游客概率为
.
(1)请将下列
列联表补充完整,并判断能否在犯错误概率不超过0.001的前提下,认为旅游预订与是否为青年有关;
(2)按照分层抽样的方法,从预订旅游客群中选取5人,再从这5人中任意选取3人,求3人中至少有2人是青年人的概率.
附:①
,其中
.
②
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/17/567cf388-74d2-4148-91f8-88e1cbacb7b0.png?resizew=138)
年龄在19-35岁的人群称为青年人群,已知在所有调查游客中随机抽取1人,抽到不预订的青年游客概率为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56b32a0aea3308e1678a290ccb84b741.png)
(1)请将下列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
预定旅游 | 不预定旅游 | 合计 | |
青年 | |||
非青年 | |||
合计 |
附:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f8ec200973736ac8bcd9aa633855d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
②
![]() | 0.050 | 0.010 | 0.001 |
![]() | 3.841 | 6.635 | 10.828 |
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3 . 椭圆
的离心率为
,
分别为
的左、右焦点,若
,
是
上
轴上方的两点且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b52ec180f5e8d075fa4788a464c2b30.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29890ab24b49714d0578624947b5e7bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c70be44a0d7232bc27f63954dc8abb15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b52ec180f5e8d075fa4788a464c2b30.png)
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4 . 已知正方体
的棱长为
是棱
的两个三等分点,则四面体
的体积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8eee07356a783330abe156ced4bdbe0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5c203fa789096869f098e7b024dae26.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2023-04-16更新
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903次组卷
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2卷引用:辽宁省锦州市2023届高三二模数学试题
解题方法
5 . 已知平面向量
满足:
,
.设向量
的夹角为
,若存在
,使得
,则
的取值范围______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e8b95a61af300412fc65f846089028.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29276b43a2950ed71f0f9629a35dfa74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/404067afb19bd74f447a6c0c832af1da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e8b95a61af300412fc65f846089028.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c51159984b2cb00f30b3986315019623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3b23637b6e43587df808d9468a4241.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
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6 . 已知函数
的最小正周期为
.
(1)求当
为偶函数时
的值;
(2)当
时,若
的图象过点
,求
的单调递增区间.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8b9ddce2413cee2366a77a3413fc906.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70f5389990c3a0c5373f3bd9fb2454c9.png)
(1)求当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6581916f5a65edfea257c804efee007e.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4456675a5dbe545462a22cef9aca8fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db6f468a48dc6491559012009ec9041f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
您最近一年使用:0次
名校
7 . 已知函数
,若
,
,且函数
在
上单调,则实数
的值______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddccb8a5531ef169be3626afa72e5f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4456675a5dbe545462a22cef9aca8fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a1a5930533ee2800e3b166a7f609503.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44d51992c05a557cf6058664f1f8961e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074c228ffc7b1e306f8410afe7bc4b5c.png)
您最近一年使用:0次
2023-04-15更新
|
337次组卷
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3卷引用:辽宁省锦州市辽西育明高级中学2022-2023学年高一下学期第一次阶段性数学试题
辽宁省锦州市辽西育明高级中学2022-2023学年高一下学期第一次阶段性数学试题(已下线)湖南省新高考教学教研联盟2023届高三下学期4月第二次联考数学试题变式题11-16山西省晋城市第一中学校2022-2023学年高一下学期第三次调研数学试题
8 . 已知
,
,
,
.
(1)当
时,求实数x的值;
(2)当
取最小值时,求向量
与
的夹角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f477ba09e089c49d1682164272b15ce3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b12dd9d46d1f29ec7158391d7c954689.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e39487345e6cb3747055bb9196b69d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/054325a67aa0e5c9bc0c72da00315f39.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f622a667018a0a1b7b9334909c136090.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/341d723e7f98dd7eec40051071b2c52a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73a0b19e69be46452425916a0fcb49c9.png)
您最近一年使用:0次
名校
9 . 下列各选项中,使数列
为递增数列的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
2023-04-13更新
|
335次组卷
|
3卷引用:辽宁省锦州市辽西育明高级中学2022-2023学年高二下学期期中数学试题
名校
解题方法
10 . 在
中,内角
,
,
所对的边分别为
,
,
,且
.
(1)求角
的大小;
(2)已知
,若
为锐角三角形,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/c5db41a1f31d6baee7c69990811edb9f.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/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74599c91aaf812cc59a64055af21e4ad.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f002f960ec07ea229ed243e2d991d83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d6fc9b90f370fbb27552876b650f8f.png)
您最近一年使用:0次
2023-04-08更新
|
988次组卷
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4卷引用:辽宁省锦州市辽西育明高级中学2022-2023学年高一下学期期中数学试题