正方体
中,
,P在正方形
内(包括边界),下列结论正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
A.若![]() ![]() |
B.三棱锥![]() ![]() |
C.若Q为正方形![]() ![]() ![]() |
D.![]() |
2024·湖北·二模 查看更多[3]
更新时间:2024-06-02 18:03:00
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【推荐1】已知
中,
,
,
为边
上的高,且
,沿
将
折起至
的位置,使得
,则( )
![](https://img.xkw.com/dksih/QBM/2021/5/18/2723899226841088/2724413604683776/STEM/f2e12a88-d0da-4cf7-a3fd-8b53ccfaa526.png?resizew=519)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d768ffd5bf75080e8ff5ce6b472c0cc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/347f1001c7ef728ec091358493d3cb59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6169cacf6c961ec78ccbd60db2726778.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acee03d4bb4667b6c345221b6c9b0fa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0150ae52a64aaec050e17e28bf679d4.png)
![](https://img.xkw.com/dksih/QBM/2021/5/18/2723899226841088/2724413604683776/STEM/f2e12a88-d0da-4cf7-a3fd-8b53ccfaa526.png?resizew=519)
A.平面![]() ![]() |
B.三棱锥![]() |
C.![]() |
D.三棱锥![]() ![]() |
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解题方法
【推荐2】已知三棱锥
的所有棱长都是
分别是三棱锥
外接球和内切球上的点,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be7ce62a6027d6d7051a6bb430dc7b09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
A.三棱锥![]() ![]() |
B.三棱锥![]() ![]() |
C.![]() ![]() |
D.三棱锥![]() ![]() |
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【推荐3】已知正四棱台
的所有顶点都在球O的球面上,
,
,
为
内部(含边界)的动点,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9a0c3a4e61b97fa9bc58f3179fc2958.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/338c6c83ab4abc895ac36ab888a55be6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55dcbe075165566acf363cd199f07ba4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d11746005a0e806f2d27f89e3d9e9c2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/5/127bbf43-f2b7-435d-a19c-de87f5d5e5c6.png?resizew=216)
A.直线![]() ![]() |
B.球O的体积为![]() |
C.直线![]() ![]() ![]() |
D.![]() ![]() |
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【推荐1】设向量
,且
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfbde7bc9bf50fe84d397a6680a86b2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dec1e969f88b8f1d474fc92ec2fd787.png)
A.向量![]() |
B.![]() |
C.![]() ![]() ![]() |
D.![]() |
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【推荐2】在正四面体
(所有棱长均相等的三棱锥)中,点
在棱
上,满足
,点
为线段
上的动点.设直线
与平面
所成的角为
,则下列结论中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac93e58e9bba899df62a4cda5f1a5ca2.png)
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A.存在某个位置,使得![]() |
B.不存在某个位置,使得![]() |
C.存在某个位置,使得平面![]() ![]() |
D.存在某个位置,使得![]() |
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【推荐1】如图,已知正四棱台的上、下底面边长分别为2和4,侧棱长为
,点
为棱
的中点,点
在侧面
内运动(包含边界),且
与平面
所成角的正切值为
,则( )
A.![]() ![]() |
B.存在点![]() ![]() |
C.存在点![]() ![]() |
D.棱长为1.5的正方体可以在此空心棱台容器内部任意转动 |
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【推荐2】如图,经过坐标原点
且互相垂直的两条直线
和
与圆
相交于
四点,
为弦
的中点,则下列说法正确的是( )
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
A.线段![]() ![]() |
B.弦![]() ![]() |
C.点![]() |
D.四边形![]() ![]() |
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