1 . 已知正方体
的棱长为2,
为
的中点,
为
所在平面上一动点,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/22/7c118efe-32f3-420d-9f08-26eca1266b48.png?resizew=165)
A.若![]() ![]() ![]() ![]() |
B.若![]() ![]() ![]() ![]() |
C.若![]() ![]() ![]() ![]() |
D.若点![]() ![]() ![]() ![]() |
您最近一年使用:0次
2 . 如图,已知三棱锥
平面
,点
是点
在平面
内的射影,点
在棱
上,且满足
.
(1)求证:
;
(2)求
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2334f72db7d296361167a00790b69031.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eed00acd878a18a2ac3c932f01ab6200.png)
![](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/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba2bd1b595743d231779a6818ab02599.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/13/8253122e-7647-4d8c-8e9e-3b72156dc185.png?resizew=126)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3dbf0e4e79a4ed378f9395330a5837b.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f0009063fe00277645aff1be6e32471.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6760f565c694d1cdb6d7068e14526d00.png)
您最近一年使用:0次
解题方法
3 . 在长方体
中,
与平面
所成的角为
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da2a70872c4eaf5802757e0eef963c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
A.异面直线![]() ![]() ![]() | B.异面直线![]() ![]() ![]() |
C.![]() ![]() ![]() | D.![]() ![]() ![]() |
您最近一年使用:0次
4 . 如图,两个共底面的正四棱锥组成一个八面体
,且该八面体的各棱长均相等,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a325f7220b9d63033befaa589646e802.png)
A.平面![]() ![]() |
B.平面![]() ![]() |
C.直线![]() ![]() ![]() |
D.平面![]() ![]() ![]() |
您最近一年使用:0次
解题方法
5 . 已知正四棱锥
的底边长为2,高为2,且各个顶点都在球
的球面上,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
A.直线![]() ![]() ![]() |
B.平面![]() ![]() ![]() |
C.球![]() ![]() |
D.球心![]() ![]() ![]() |
您最近一年使用:0次
解题方法
6 . 已知正方体
的棱长为1,点
满足
,
(
与
三点不重合),则下列说法正确的是( )
![](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/11ae7072624587654d162548a80d7a1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6da55fea580ca1efa66cb4de0d24a20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3ccc6b9e27a149ffb7b2196eda25bb0.png)
A.当![]() ![]() ![]() |
B.当![]() ![]() ![]() |
C.当![]() ![]() ![]() |
D.当![]() ![]() ![]() ![]() |
您最近一年使用:0次
解题方法
7 . 如图,在矩形
中,
,
沿对角线
向上翻折,得到
,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37eea7427ee5eeadc693db92b9eb7f51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dafb259e8372485bf3ca36ec4e37122a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/18/108f56f0-a72a-4c24-8e1d-1ed06f0319cb.png?resizew=148)
A.存在点![]() ![]() |
B.三棱锥![]() ![]() |
C.当![]() ![]() ![]() ![]() |
D.当![]() ![]() ![]() ![]() ![]() |
您最近一年使用:0次
8 . 如图所示,四边形
是长方形,
,半圆面
平面
.点
为半圆弧
上一动点(点
不与点
重合).下列说法正确的有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/13/3a77339d-e6b4-4bbe-98cb-5eaa70eb1e43.png?resizew=226)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73ba94cec6c03980be9ca03774379fa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3e2bed5ce5fe466395d2f5743d335b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6f9353ca110c8b81561455b232dbc15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65436512ecbaefba4ac8123c55094211.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/13/3a77339d-e6b4-4bbe-98cb-5eaa70eb1e43.png?resizew=226)
A.三棱锥![]() |
B.三棱锥![]() |
C.异面直线![]() ![]() ![]() |
D.当直线![]() ![]() ![]() ![]() ![]() |
您最近一年使用:0次
解题方法
9 . 古希腊数学家阿波罗尼斯采用平面切割圆锥面的方法来研究圆锥曲线.后经研究发现:当圆锥轴截面的顶角为
时,用一个与旋转轴所成角为
的平面
(不过圆锥顶点)去截该圆锥面,则截口曲线(圆锥曲线)的离心率为
.比如,当
时,
,即截得的曲线是抛物线.如图,在空间直角坐标系
中放置一个圆锥,顶点
,底面圆O的半径为2,直径AB,CD分别在x,y轴上,则下列说法中正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/13/d41359ad-7f9e-4e5a-817d-0f9cb36bf3c5.png?resizew=174)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8dd0c52aca1675c17b9a019aa7901e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f435efcc7869eec21bdba1ed81dc3f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e55f4e5a5d84670bbf3de150da74b62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffa3205b1df826d63914dcb55bb3ab43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09dbcaa127022fbd6b6f13345196408a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a834024400d0730af3e640ca4d5f54b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd5467f64f0f9f4293c63f0dce1c0f42.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/13/d41359ad-7f9e-4e5a-817d-0f9cb36bf3c5.png?resizew=174)
A.已知点![]() ![]() |
B.平面MAB截该圆锥得的截口曲线为抛物线的一部分 |
C.若![]() |
D.若平面![]() ![]() ![]() |
您最近一年使用:0次
10 . 在正三棱柱
中,
,点
为棱
的中点,则直线
与平面
夹角的正弦值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6c5282bc1ea20767a6c092c22c761ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac61c24f99a4e466f1e2ea011893866.png)
您最近一年使用:0次