解题方法
1 . 已知正方体
的棱长为
是空间中的一动点,下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0342946a0f827001a879cad686d1cf68.png)
A.若![]() ![]() ![]() ![]() |
B.平面![]() ![]() |
C.若![]() ![]() ![]() |
D.若![]() ![]() ![]() ![]() |
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2 . 如图所示,在四棱锥
中,底面
是边长为
的正方形,
平面
二面角
的大小为
,
分别是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/fbbe7b72-05a9-480e-93cf-b17cbbee91b2.png?resizew=175)
(1)求证:
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cab69dcbdcd191102b0daf913c730055.png)
(2)在线段
上是否存在一点
,使得点
到平面
的距离为
,若存在,求出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a955d5dab19e35c8e2a4437dae9e93f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10c83f8945042b9c8fb2fbdac9308d62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efe11ff2c080a2346c3a0f156ebaabd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ee460fa5eec406f491e514ffd6285e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9955b5aebb73cd84447e8541f901ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6241f9ef86cd0a902cbadaf336767dbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e6fec562d0b646ee75abe1cce5926d1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/fbbe7b72-05a9-480e-93cf-b17cbbee91b2.png?resizew=175)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93cbe73724146a6ae435dc1fa7e88b95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cab69dcbdcd191102b0daf913c730055.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc704b98f4ed2c7359a7a5b6498b5290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7294f5ae2a24ff42e84cd9773b2a7287.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23901e208d26f1332a51d26cedab4677.png)
您最近一年使用:0次
2019-05-08更新
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2007次组卷
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8卷引用:山西省朔州市怀仁市2023-2024学年高二上学期第二次教学质量调研数学试题