名校
1 . 在正方体
中,点
,
满足
,
,给出下列4个命题:
![](https://img.xkw.com/dksih/QBM/2021/11/8/2847094571835392/2847356345024512/STEM/fa726ef76df843c1b1b8a205f774df16.png?resizew=153)
①存在
,使
;
②存在
,使直线
与直线
共面;
③任意
,
的面积为定值;
④任意
,均有
.
其中,正确命题的序号为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11819586164b4c8c61fc01199c65327a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e6db8a3fe1c37e9eee6207541f9347d.png)
![](https://img.xkw.com/dksih/QBM/2021/11/8/2847094571835392/2847356345024512/STEM/fa726ef76df843c1b1b8a205f774df16.png?resizew=153)
①存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e99146aec0102a510f2357b7013e2d2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18ee20f80fb0a9524662ce03f48e8157.png)
②存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e99146aec0102a510f2357b7013e2d2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24006d28116bc097933cc90bcc0ea69f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
③任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e99146aec0102a510f2357b7013e2d2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8dcc9f79fe5f07f25447aa442ee14ad.png)
④任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e99146aec0102a510f2357b7013e2d2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/142c742a4226a2a6873bd55ca8b1f021.png)
其中,正确命题的序号为
您最近一年使用:0次
名校
2 . 已知
是不重合的两条直线,
为不重合的两个平面,给出下列命题:
①若
,
,则
;
②若
,且
,则
;
③若
,
,则
.
所有正确命题的序号为__ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280860dd039e1305a5ccc455f63e8223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e288596fa3811dd2c17bded60e82e7.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fe920cd78db25f5b4df37d066e57800.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/808c6d37467a5c995d71e49408503927.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5986f2991d45fbf3578f08f27d9fd7e.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4042f9c51f83e3367d496e851735d7f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35f747152f006301e03b643afb80195c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/808c6d37467a5c995d71e49408503927.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fe920cd78db25f5b4df37d066e57800.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79018590293277ff2d76452a50ad2dbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84b6e422b2e6f6dada4d8c369559a077.png)
所有正确命题的序号为
您最近一年使用:0次
名校
3 . 已知
,
,则下列命题中所有正确命题的序号为______ .
①存在
,使得
的单调区间完全一致;
②存在
,使得
的零点完全相同;
③存在
,使得
分别为奇函数,偶函数;
④对任意
,恒有
的零点个数均为奇数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/402ce8a613e5f2fbb94a97bbe670638d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12f9d0624e29b819bfcf26187ae043db.png)
①存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c0e9d1ad9561d693958756ee8398218.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8fd1e808e015f4cb43d2e3a0529ac6a.png)
②存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c0e9d1ad9561d693958756ee8398218.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e513e8e01e8c436b4c8900b31f6cd571.png)
③存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c0e9d1ad9561d693958756ee8398218.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/348655470887ca720aa5a436867dda7e.png)
④对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c0e9d1ad9561d693958756ee8398218.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/348655470887ca720aa5a436867dda7e.png)
您最近一年使用:0次
2019-05-04更新
|
456次组卷
|
2卷引用:北京市牛栏山第一中学2020-2021学年高二下学期期中考试数学试题
名校
4 . 在棱长为1的正方体
中,M,N分别为
,
的中点,点P在正方体的表面上运动,且满足
.给出下列说法:
①点P可以是棱
的中点;
②线段MP的最大值为
;
③点P的轨迹是正方形;
④点P轨迹的长度为
.
其中所有正确说法的序号是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734023d4e70010a6b2cc3267cb86e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32df475a4f2164dcecfe1bd57fa4d51e.png)
①点P可以是棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
②线段MP的最大值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
③点P的轨迹是正方形;
④点P轨迹的长度为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e3c39ce9add8e7816cbc4b46bacee85.png)
其中所有正确说法的序号是
![](https://img.xkw.com/dksih/QBM/2021/10/21/2834327540457472/2834918643785728/STEM/1e43574a-7de6-4969-a15c-efee57c33344.png?resizew=256)
您最近一年使用:0次
2021-10-22更新
|
808次组卷
|
3卷引用:北京朝阳陈经纶中学2021-2022学年高二10月月考数学试题
北京朝阳陈经纶中学2021-2022学年高二10月月考数学试题河南省濮阳市第一高级中学2023-2024学年高二上学期第二次质量检测数学试题(已下线)专题8-1 立体几何中的轨迹问题-2022年高考数学毕业班二轮热点题型归纳与变式演练(全国通用)
名校
解题方法
5 . 某学校组织了垃圾分类知识竞赛活动.设置了四个箱子,分别写有“厨余垃圾”、“有害垃圾”、“可回收物”、“其它垃圾”;另有卡片若干张,每张卡片上写有一种垃圾的名称.每位参赛选手从所有卡片中随机抽取
张,按照自己的判断,将每张卡片放入对应的箱子中.按规则,每正确投放一张卡片得
分,投放错误得
分.比如将写有“废电池”的卡片放入写有“有害垃圾”的箱子,得
分,放入其它箱子,得
分.从所有参赛选手中随机抽取
人,将他们的得分按照
,
,
,
,
分组,绘成频率分布直方图如图:
![](https://img.xkw.com/dksih/QBM/2020/1/12/2375397800370176/2375693394919424/STEM/6242e47b07614aa985de22f07367d44d.png?resizew=257)
(1)分别求出所抽取的
人中得分落在组
和
内的人数;
(2)从所抽取的
人中得分落在组
的选手中随机选取
名选手,以
表示这
名选手中得分不超过
分的人数,求
的分布列和数学期望;
(3) 如果某选手将抽到的20张卡片逐一随机放入四个箱子,能否认为该选手不会得到100分?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5d86c23bb58b594500fe27fa6cc69ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b55ed73845376502cb1fc7d7ceee76f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5254df8ed1963100a1f506bd12d7de5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1445498d3a0555e0fe905038a4010c3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fd6f9d0f9826db797ef5a4c1d245e.png)
![](https://img.xkw.com/dksih/QBM/2020/1/12/2375397800370176/2375693394919424/STEM/6242e47b07614aa985de22f07367d44d.png?resizew=257)
(1)分别求出所抽取的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5d86c23bb58b594500fe27fa6cc69ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b55ed73845376502cb1fc7d7ceee76f6.png)
(2)从所抽取的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22b18c7751c6e9e1484ffbfa6954be34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
(3) 如果某选手将抽到的20张卡片逐一随机放入四个箱子,能否认为该选手不会得到100分?请说明理由.
您最近一年使用:0次
2020-01-12更新
|
680次组卷
|
6卷引用:北京市首都师范大学附属中学2020-2021学年高二上学期期末考试数学试题
北京市首都师范大学附属中学2020-2021学年高二上学期期末考试数学试题北京市海淀区中关村中学2022届高三上学期开学测试数学试题北京市朝阳区2019-2020学年高三上学期期末数学试题(已下线)专题02 少丢分题目强化卷(第二篇)-备战2021年新高考数学分层强化训练(北京专版)北京市八一学校2022届高三下学期摸底测试数学试题北京市玉渊潭中学2023届高三下学期开学摸底数学试题