1 . 两个顶点朝下竖直放置的圆锥形容器盛有体积相同的同种液体(示意图如图所示),液体表面圆的半径分别为3,6,则窄口容器与宽口容器的液体高度的比值等于__________ .
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/12/70f2a528-2684-4083-86dd-9b8803608e53.png?resizew=187)
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名校
2 . 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
|
435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
名校
3 . 从定义域及值域均为
的函数中随机选一个记为
,则
的概率为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b26bbb11e932ddb26a9088e7fc33e87b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bed932e58f4cb2095ace5acd0645305d.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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4 . 作为我国古代称量粮食的量器,米斗有着吉祥的寓意,是丰饶富足的象征,带有浓郁的民间文化韵味.右图是一件清代老木米斗,可以近似看作正四棱台,测量得其内高为
,两个底面内棱长分别为
和
,则估计该米斗的容积为__________
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bc6a8e3c0184a6f39ba69966efee510.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caa87e5b49076f307a135bb2f63fa61d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88c91ad3232cbcde8272c78893b828d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33691e3419e3f8f9c2bc36d1627b7541.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/1/72ad00ec-68e5-4425-8894-56a3fdcc63fa.png?resizew=209)
您最近一年使用:0次
2024-02-10更新
|
386次组卷
|
2卷引用:北京市海淀区2023-2024学年高二上学期期末练习数学试卷
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)
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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
名校
8 . 已知整数
,数列
是递增的整数数列,即
且
定义数列
的“相邻数列”为
,其中
或![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dee0bbc97117cddfdcdf148d92b5d1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a613eefdacfc611bbe69514eec2d5aa8.png)
(1)已知
,数列
,写出
的所有“相邻数列”;
(2)已知
,数列
是递增的整数数列,
,且
的所有“相邻数列”均为递增数列,求这样的数列
的个数;
(3)已知
,数列
是递增的整数数列,
,且存在
的一个“相邻数列”
,对任意的
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5818ede14d21f6df9ef9c2bfe09286c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d474360f3650b435422b925c7de7c0ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b07b8019e3b1561635042ea589126b15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f846d93390223b563770b676ee30b06c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca4b177a056b806e6389db9397891963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5ca042f30e8814ad6f3dfc820eb2100.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dee0bbc97117cddfdcdf148d92b5d1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a613eefdacfc611bbe69514eec2d5aa8.png)
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fac3649308b528fd56545ba102dc42d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee34bed3d3cbcbe9f351c2fbe1f08e9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe08722cf9300fe188dbbb71989c06c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5906e621de4f31a011d9696f19c5a03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51128198ebf849b706e1df99d71a2fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fafbc94594b8c877de8883dea10e374c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00d1ddad8dfcef0761c6e645ececa2a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21d64548546547314a555333fd07b1aa.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/ec51ee00b796b08a2aef72d661c73966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/066bed69d03aee63a37e1259f6599e55.png)
您最近一年使用:0次
2024-02-04更新
|
532次组卷
|
4卷引用:北京市清华附中高22级2023-2024学年高二上学期期末数学试题
北京市清华附中高22级2023-2024学年高二上学期期末数学试题北京市清华大学附中2023-2024学年高二上学期期末数学试题北京市陈经纶中学2023-2024学年高二下学期4月期中诊断数学试卷(已下线)压轴题数列新定义题(九省联考第19题模式)讲
9 . 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
10 . 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