1 . 折纸既是一种玩具,也是一种艺术品,更是一种思维活动.如图,有一张直径为4的圆形纸片,圆心为
,在圆内任取一点
,折叠纸片,使得圆周上某一点刚好与点
重合,记此时的折痕为
,点
在
上,则
的最小值为( )
![](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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f68815ee48560500c184da6f76bced7.png)
A.5 | B.4 | C.3 | D.2 |
您最近一年使用:0次
2024-02-23更新
|
372次组卷
|
7卷引用:信息必刷卷01(北京专用)
2 . 在早高峰,某路口通过的车辆
与时间
的关系近似地符合
,在早高峰这段时间内.给出下列四个结论:
①通过该路口的车辆数
随着时间
逐渐增多;
②早上6时和早上7时通过该路口的车辆数
相等;
③在任意时刻,通过路口的车辆
不会超过35辆;
④在任意时刻,通过路口的车辆
不会低于14辆.
依据上述关系式,其中所有正确结论的序号是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf323edf67acb35133a93bc6f8e96433.png)
①通过该路口的车辆数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
②早上6时和早上7时通过该路口的车辆数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
③在任意时刻,通过路口的车辆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
④在任意时刻,通过路口的车辆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
依据上述关系式,其中所有正确结论的序号是
您最近一年使用:0次
解题方法
3 . 已知某公司统计了一种产品在2023年各月的销售情况,如图,公司将每连续3个月的销售量做为一个观测组,对该公司这种产品的销售量(单位:万)进行监测和预测.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/17/18266da7-1731-407a-ae7c-dbce72bcea99.png?resizew=410)
(1)现从产品的10个观测组中任取一组,求组内三个月中至少有一个销售量高于50万的概率;
(2)若当月的销售量大于上一个月的销售量,则称该月的销售指数增长;若当月的销售量小于上一个月的销售量,则称该月的销售指数下降.(已知1月份的销售量低于2022年12月份销售量).现从10个观测组中任取一组,求抽到的观测组中销售指数增长月份恰有2个的概率.
(3)假设该产品每月的销售指数是否增长只受上一个月销售指数的影响,预测2024年1月份“销售指数增长”和“销售指数下降”的概率估计值哪个最大(直接写出结果).
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/17/18266da7-1731-407a-ae7c-dbce72bcea99.png?resizew=410)
(1)现从产品的10个观测组中任取一组,求组内三个月中至少有一个销售量高于50万的概率;
(2)若当月的销售量大于上一个月的销售量,则称该月的销售指数增长;若当月的销售量小于上一个月的销售量,则称该月的销售指数下降.(已知1月份的销售量低于2022年12月份销售量).现从10个观测组中任取一组,求抽到的观测组中销售指数增长月份恰有2个的概率.
(3)假设该产品每月的销售指数是否增长只受上一个月销售指数的影响,预测2024年1月份“销售指数增长”和“销售指数下降”的概率估计值哪个最大(直接写出结果).
您最近一年使用:0次
名校
4 . 共享单车已经逐渐成为人们在日常生活中必不可少的交通工具.通过调查发现人们在单车选择时,可以使用“
竞争函数”进行近似估计,其解析式为
(其中参数a表示市场外部性强度,a越大表示外部性越强).给出下列四个结论:
①
过定点
;
②
在
上单调递增;
③
关于
对称;
④取定x,外部性强度a越大,
越小.
其中所有正确结论的序号是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be5897a73368419a2e6d54bd5b49e83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5926523d3dfe59ebd72445b054e383f2.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/782e6aab135b30eed10b49df5a91988d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a982c17d1a94a9bd81dc27cad133b74.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/782e6aab135b30eed10b49df5a91988d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/304226ca50149b49702928e44d565964.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/782e6aab135b30eed10b49df5a91988d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b650820d7bed48ed67a2869ad8c65ff1.png)
④取定x,外部性强度a越大,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/782e6aab135b30eed10b49df5a91988d.png)
其中所有正确结论的序号是
您最近一年使用:0次
2024-02-10更新
|
431次组卷
|
3卷引用:北京市海淀区2023-2024学年高一上学期期末考试数学试题
解题方法
5 . 已知椭圆
的上顶点为
,圆
.对于圆
,给出两个性质:
①在圆
上存在点
,使得直线
与椭圆
相交于另一点
,满足
;
②对于圆
上任意点
,圆
在点
处的切线与椭圆
交于
,
两点,都有
.
(1)当
时,判断圆
是否满足性质①和性质②;(直接写出结论)
(2)已知当
时,圆
满足性质①,求点
和点
的坐标;
(3)是否存在
,使得圆
同时满足性质①和性质②,若存在,求出
的值;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb5df95a756627611d0562f76e055d8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fed9d00388be6a5f77a0d992397509d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
①在圆
![](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/2cdba1337ec85fa9722cb4b320a82ae6.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/7f66560b7385c4a9d183ebe6b1b6112f.png)
②对于圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c0b06dc01c30d13f64be2ac6a1d811e.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87b351f16728b0023fd63678f8103c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(2)已知当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90e5b502a4ab157d36379c98ca8928ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)是否存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b829d3ded5f93007d3ba22f2a862efe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
解题方法
6 . 某校为了调查学生的体育锻炼情况,从全校学生中随机抽取100名学生,将他们的周平均锻炼时间(单位:小时)数据按照
,
,
,
,
分成5组,制成了如图所示的频率分布直方图.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/8/b4a7fa86-9124-4383-866d-5ce383689038.png?resizew=249)
(1)求
的值;
(2)用分层抽样的方法从
和
两组中抽取了6人.求从这6人中随机选出2人,这2人不在同一组的概率;
(3)假设同组中的每个数据用该区间的中点值代替,试估计全校学生周平均锻炼时间的平均数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/328333e8a872d3c968a3e1a1f48b7c87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf41c911922defde71eb49b3fe692307.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00c8990d108a0b5b5a396ed568f18df3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33de8294567803cabb0dbf41304f4a7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d79b61a7eaea095377b69fb687510a9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/8/b4a7fa86-9124-4383-866d-5ce383689038.png?resizew=249)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)用分层抽样的方法从
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33de8294567803cabb0dbf41304f4a7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d79b61a7eaea095377b69fb687510a9.png)
(3)假设同组中的每个数据用该区间的中点值代替,试估计全校学生周平均锻炼时间的平均数.
您最近一年使用:0次
7 . 已知函数
,
为偶函数,且当
时,
,记函数
,给出下列四个结论:
①当
时,
在区间
上单调递增;
②当
时,
是偶函数;
③当
时,
有3个零点;
④当
时,对任意
,都有
.
其中所有正确结论的序号是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fda5ab0495110870938c761638ae6ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e2e79843faf62dde86bf858d1e0569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fed62208af6047cd1374c6db9d21e8c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50a3bc841b0c96fada3e4f8ca5f1396f.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/143b917df0520097be222accbddf9394.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c787b3ae93138bac7485c406d29f94b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5069fb2cd95b9595065b4294e308322.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bd2215e5cdeb3f6b0b7929a4a05ba65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c787b3ae93138bac7485c406d29f94b1.png)
③当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3a915c1a8a9304aeb307d130faaeb15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c787b3ae93138bac7485c406d29f94b1.png)
④当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6163bf8b74410bfb93919ec5130795ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a57996290794e082b21d8f1dfc322a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/078f88a148727f0bba99fde30d056d03.png)
其中所有正确结论的序号是
您最近一年使用:0次
8 . 已知抛物线顶点在原点,以坐标轴为对称轴,从以下两个条件中任选一个条件,并根据所选条件写出一个抛物线的标准方程.①焦点
;②经过点
.你所选的条件是______ ,得到的一个抛物线标准方程是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63309dbc3612815f6dbdee23d9a10adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39ea1f5bdd213c7c3a571b4c38850bf1.png)
您最近一年使用:0次
9 . 已知展台上四个盲盒中装有由卡通动漫人物设计的四款不同的产品,学生甲喜欢其中的一款.甲从四个盲盒中抽选两个,则“学生甲抽到了喜欢的那一款”的概率为( )
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
10 . 对于给定的奇数
,设
是由
个实数组成的
行
列的数表,且
中所有数不全相同,
中第
行第
列的数
,记
为
的第
行各数之和,
为
的第
列各数之和,其中
.记
.设集合
或
,记
为集合
所含元素的个数.
(1)对以下两个数表
,
,写出
,
,
,
的值;
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/2/e69407e7-892f-4a4f-952f-72fcf655e5f4.png?resizew=138)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/2/c396e40f-d96e-4dad-b60b-54bbd480977d.png?resizew=138)
(2)若
中恰有
个正数,
中恰有
个正数.求证:
;
(3)当
时,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84de01db26d435ab45acdf26cfefe625.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/823b5260d6b24cc69747c0455c879b7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](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/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7600d2cfbdc6146db96cc545706004f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267e1fe5e16e9dc9641c7736528e1235.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/449fa836b7477adb5c394b8e67af6a87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02eca2f89985a104ddeebdf89629ade7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7600d2cfbdc6146db96cc545706004f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f76063c9d41d3398308bf7d25938d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9164331fb78ebe6059e69060f3ab302a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d418009b040d5e5192d28417b459890.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63e75ee8469247f599502aec2f2ee552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b811354062228d1e2e090aa587259c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
(1)对以下两个数表
![](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/c9d98b87ea379019dea6dbd58ebaf19f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebed69dd5f3ef7ff5eccd8031e4771ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc8b030e661224065ec16aa272782b44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a135dc0cf986199b13a3ce1106379e16.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/2/e69407e7-892f-4a4f-952f-72fcf655e5f4.png?resizew=138)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/2/c396e40f-d96e-4dad-b60b-54bbd480977d.png?resizew=138)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7de7bdfbb18abcc2d1575d1228489f56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93f4518b3c93a17e13fc06affa23e519.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31eb153a2133b41486193e3c3b633d3c.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c7a1d739890a8951586e23b78b035bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8181afecca9a1adc761a2184543fd2e5.png)
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