1 . 如图,在四棱台
中,底面
是菱形,
,
,
平面
.
(1)证明:
.
(2)棱
上是否存在一点E,使得二面角
的余弦值为
?若存在,求线段
的长;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50cb59da6e7882e4328b766777ee15d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/3a816394-77b8-4c6f-ae62-e3e25149cbbb.png?resizew=204)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a382ccd078374f1efebb26a43599e596.png)
(2)棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54ad0edb590fa1cc97383714f87cbda6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9af46237d7279ffb682d57e4e7b57a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
您最近一年使用:0次
2023-12-28更新
|
583次组卷
|
4卷引用:高二数学开学摸底考01(新高考地区)-2023-2024学年高中下学期开学摸底考试卷
(已下线)高二数学开学摸底考01(新高考地区)-2023-2024学年高中下学期开学摸底考试卷江西省“三新”协同教研共同体2023-2024学年高二上学期12月联考数学试卷 辽宁省辽阳市2023-2024学年高二上学期1月期末考试数学试卷(已下线)第七章 应用空间向量解立体几何问题拓展 专题一 立体几何非常规建系问题 微点3 立体几何非常规建系问题(三)【培优版】
解题方法
2 . 如图,三棱锥
中,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/a1749a6f-4c83-4b32-ba37-78cc6a9f3526.png?resizew=169)
(1)求证:
;
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb96e0331eebe80ed1ff610faf531fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611b0b42afa0c08caa344010bfef71d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2f39d3fcb1664705228e683c2cc3b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ac10caa6de9fc55d96cd9a5a797d4bd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/a1749a6f-4c83-4b32-ba37-78cc6a9f3526.png?resizew=169)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bbd7c2767c106faf27d6a97ebc8e739.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
您最近一年使用:0次
2020-08-18更新
|
161次组卷
|
4卷引用:西藏昌都市第一高级中学2021届高三下学期入学考试数学(文)试题
西藏昌都市第一高级中学2021届高三下学期入学考试数学(文)试题西藏拉萨市2020届高三第二次模拟考试数学(文)试题2020届广东省广州市高三3月阶段训练(一模)数学(文)试题(已下线)专题19 立体几何综合-2020年高考数学(文)母题题源解密(全国Ⅲ专版)