(请用空间向量求解)已知正四棱柱
中,
,
,
分别是棱
,
上的点,且满足
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/28/a0cae038-d59c-4d12-aa50-2ba81aad0d78.png?resizew=150)
(1)求异面直线
,
所成角的余弦值;
(2)求平面
与平面
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d927585a17c2e98ef7d5a9589a26ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18f166fe0e3f4196b7a34c5ed309a597.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64b9d30cd3ef321d51fcf0ad5201905b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/28/a0cae038-d59c-4d12-aa50-2ba81aad0d78.png?resizew=150)
(1)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/becf2941e15d668d93ea6ed980afd0ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69a7bcc1efb8a2ff57d64b6d057da463.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02c4f474f2c144be8703517ef72b98a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a87e6b1915ffd6bdb85808ec6a15e1cc.png)
更新时间:2023-11-05 21:53:12
|
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【推荐1】如图,在正方体ABCD﹣A1B1C1D1中,E是C1D1的中点,正方体棱长为2,求异面直线DE与AC所成角的余弦值.
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【推荐2】如图,在正方体
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解答题-证明题
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适中
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名校
解题方法
【推荐1】如图,三棱柱
的所有棱长都为3,点
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(2)设
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1857eadd6b23a87a1a5b4ffff584efd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/100da1c62b219145a42cabf619ccc0ce.png)
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(0.65)
真题
【推荐2】如图,在五棱锥
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/16/dfed0b05-2ba1-4d10-bfd2-7041decb772b.png?resizew=163)
(1)求异面直线
与
所成的角;(用反三角函数值表示)
(2)证明:
平面
;
(3)用反三角函数值表示二面角
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/989babd4c8db2422e5d239e03dae94b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10c83f8945042b9c8fb2fbdac9308d62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96c6a57517fb8cdbe016cdee4aa64756.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7fc9b1a395ad2e2fb2b207560754dc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73320c736844aaf8e0cc98542a227513.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/16/dfed0b05-2ba1-4d10-bfd2-7041decb772b.png?resizew=163)
(1)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d4db9b82b67efe45a02fca32bfcf5dc.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9c9cfa597b444b5c9dbae7a825a695.png)
(3)用反三角函数值表示二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c53f1e79257ff52a0408fdc482488d0.png)
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