1 . 在平面直角坐标系xOy中,以Ox为始边的两个角
,
的终边分别与单位圆O交于点M,N,已知M,N关于原点对称
(1)若点M的坐标为
,求
,
的值;
(2)当
时,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
(1)若点M的坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc1f9e2a36dcab6934f15e84452c91e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d66c03d4ca06819a6ce7fc8ea6de0f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eacde1c42151734fdc60f3001b590de.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/941647c1647511a05d56a58f0a21472d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d8b6c6718a3a7ba6598ee914187bee0.png)
您最近一年使用:0次
名校
解题方法
2 . 关于曲线
,给出下列四个结论:
①曲线C关于原点对称,但不关于x轴、y轴对称;
②曲线C恰好经过4个整点(即横、纵坐标均为整数的点);
③曲线C上任意一点都不在圆
的内部;
④曲线C上任意一点到原点的距离都不大于
.
其中,正确结论的序号是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48587273b5b9231cfa386411c3985242.png)
①曲线C关于原点对称,但不关于x轴、y轴对称;
②曲线C恰好经过4个整点(即横、纵坐标均为整数的点);
③曲线C上任意一点都不在圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49137970108f50350a3211aa0281faaf.png)
④曲线C上任意一点到原点的距离都不大于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
其中,正确结论的序号是
您最近一年使用:0次
2020-04-28更新
|
563次组卷
|
4卷引用:2020届北京市朝阳区六校联考高三年级四月份测试数学试题A
解题方法
3 . 近年来,随着5G网络、人工智能等技术的发展,无人驾驶技术也日趋成熟.为了尽快在实际生活中应用无人驾驶技术,国内各大汽车研发企业都在积极进行无人驾驶汽车的道路安全行驶测试.某机构调查了部分企业参与测试的若干辆无人驾驶汽车,按照每辆车的行驶里程(单位:万公里)将这些汽车分为4组:
,
,
,
并整理得到如下的频率分布直方图:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/3032358e-e8cf-4433-ae79-695926fecb07.png?resizew=252)
(I)求a的值;
(Ⅱ)该机构用分层抽样的方法,从上述4组无人驾驶汽车中随机抽取了10辆作为样本.从样本中行驶里程不小于7万公里的无人驾驶汽车中随机抽取2辆,其中有X辆汽车行驶里程不小于8万公里,求X的分布列和数学期望;
(Ⅲ)设该机构调查的所有无人驾驶汽车的行驶里程的平均数为
.若用分层抽样的方法从上述4组无人驾驶汽车中随机抽取10辆作为样本,其行驶里程的平均数为
;若用简单随机抽样的方法从上述无人驾驶汽车中随机抽取10辆作为样本,其行驶里程的平均数为
.有同学认为
,你认为正确吗?说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a6600cb3ffdca809d1c4de7ca42e59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/766475bf924ae2d7e4888f443695c54f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01df297a58f36db001b63fecc2f4b882.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/868d470cac35d0599bd3786087d75473.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/3032358e-e8cf-4433-ae79-695926fecb07.png?resizew=252)
(I)求a的值;
(Ⅱ)该机构用分层抽样的方法,从上述4组无人驾驶汽车中随机抽取了10辆作为样本.从样本中行驶里程不小于7万公里的无人驾驶汽车中随机抽取2辆,其中有X辆汽车行驶里程不小于8万公里,求X的分布列和数学期望;
(Ⅲ)设该机构调查的所有无人驾驶汽车的行驶里程的平均数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e34bde9ce11f753f3e3631fbd0112fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b915ea3069054b7389cee9827dd613c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c55ec3fc6a2a218803229a6fe3ab2679.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a4808c7763813a94c844c41d422c6a8.png)
您最近一年使用:0次
2020-11-06更新
|
584次组卷
|
4卷引用:北京市朝阳区2020届高三年级下学期二模数学试题
北京市朝阳区2020届高三年级下学期二模数学试题(已下线)第十二单元 复数(B卷 滚动提升检测)-2021年高考数学(理)一轮复习单元滚动双测卷(已下线)专题11 统计-备战2021年高考数学(理)纠错笔记北京市东北师范大学附属中学朝阳学校2021-2022学年高二6月测试数学试题
名校
4 . 回文数是指从左到右与从右到左读都一样的正整数,如
,
,
,
等,显然
位回文数有
个:
,
,
,
,
,
位回文数有
个:
,
,
,
,
,
,
,
.
(
)
位回文数有__________ 个.
(
)
位回文数有__________ 个.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f76fba0fe83cf0aa9a68210591cac1a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d0b71b8d2c183154221f717ce09077b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12e23feee15a39067af60591ea5bece9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ead0dc8b0a6b8491c5a8299d394b83ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d02ea8c4988c5c28ab93f0d70fb55a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d0b71b8d2c183154221f717ce09077b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f76fba0fe83cf0aa9a68210591cac1a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ec714b7d7a203ecbcef9232ee7d40da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e9ba3f640f57c0cece089dfd19b4970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a17161b28b6ad8f57abc5b11e1b6c671.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7070546e4014f28fb2eaed777ec1dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6f6b87e8a5301b439149a0181737e81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/954a2802eb5dd8d0f92c15cdf0698d57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b81940df5d9679990fa74aad46318a68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e60a7ba5aad2d5aa058060721913acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a5fa65d80544936e2ef93ea4fdd8e94.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e562f019cb065631491e1d05867d589f.png)
您最近一年使用:0次
2018-04-01更新
|
1155次组卷
|
3卷引用:北京市朝阳三里屯2016-2017学年高二下学期期中考试数学(理)试题
名校
5 . 已知集合
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed0081de4e04574dd0884c4e6077fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/119ebcd727d678bf50abf2a0f10635f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95e60375f97ff7854f4d3a8b1108d2e3.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2020-05-11更新
|
530次组卷
|
2卷引用:2020届北京市朝阳区高三第一次模拟考试数学试题
名校
6 . 设集合
,
,则
=( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cac6509f4b82ba532d6be0f51b86928e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c932dc56c48473b49cba640670d1749c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fdbfa7a63fdf5717d40c8c9a73ec160.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
2020-04-16更新
|
556次组卷
|
4卷引用:2020届北京市朝阳区六校高三四月联考数学(B卷)试题
2020届北京市朝阳区六校高三四月联考数学(B卷)试题(已下线)理科数学-2020年高考押题预测卷02(新课标Ⅰ卷)《2020年高考押题预测卷》江西省宜春市2021届高三高考数学(理)模拟试题江苏省无锡市天一中学2020-2021学年高二下学期期末学情检测数学试题
名校
7 . 设集合
,
,若
,则
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4281221ee1e24c0648b49e25dd194ea0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76519a8b8189cd49fc8d11647ae33483.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dea9a4259cca10c1f5af28e621ebafd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
A.![]() | B.![]() |
C.![]() ![]() | D.![]() |
您最近一年使用:0次
2021-01-05更新
|
403次组卷
|
3卷引用:江西省南昌县莲塘第三中学2019-2020学年高一下学期期末考试数学试题
江西省南昌县莲塘第三中学2019-2020学年高一下学期期末考试数学试题北京市对外经济贸易大学附属中学(北京市第九十四中学)2023届高三上学期数学期末复习试题(已下线)第01讲:集合期末高频考点题型讲与练-《考点·题型·难点》期末高效复习
8 . 设函数
,则“
”是“
有且只有一个零点”的( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbbe7cb0ef366ee2ef6961d1f5f9eb21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6455e38ff53ede2508e4d9cb23f0b86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
A.充分而不必要条件 | B.必要而不充分条件 |
C.充分必要条件 | D.既不充分也不必要条件 |
您最近一年使用:0次
2020-01-12更新
|
557次组卷
|
2卷引用:北京市朝阳区2019-2020学年高三上学期期末数学试题
9 . 已知椭圆
,圆
(
为坐标原点).过点
且斜率为
的直线与圆
交于点
,与椭圆
的另一个交点的横坐标为
.
(1)求椭圆
的方程和圆
的方程;
(2)过圆
上的动点
作两条互相垂直的直线
,
,若直线
的斜率为
且
与椭圆
相切,试判断直线
与椭圆
的位置关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cd432589cb00c29cac1806288e99ed0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e63ab1f0053203fa5f310d191d0a987e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f114df5ceabdb7e5fd3fdad4eaf056.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd9903b063c08d9d3ada396cf598cc21.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(2)过圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bcb166b53a49e393871bcb14a528792.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
您最近一年使用:0次
名校
10 . 在极坐标系中,直线
与圆
的位置关系为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/610c0771fa9e9de50e5836eb579158f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3dc2c09a9d082bf57a554a023a22096.png)
A.相交且过圆心 | B.相交但不过圆心 | C.相切 | D.相离 |
您最近一年使用:0次
2019-04-20更新
|
710次组卷
|
3卷引用:北京市朝阳区2018届高三年级第二次综合练习数学(理)测试试题