名校
1 . 如图,三棱锥
中的三条棱
两两互相垂直,
,点
满足
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/29/7ab9e002-ef32-4e3e-b432-a420b0aaa507.png?resizew=158)
(1)证明:
平面
.
(2)若
,求异面直线
与
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1361092e790e4154a14aea9d0db65a9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ea6ce40f9bd9083dd8e40822f21ebb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fe9b0c00cab139524b79ab2847e462e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/29/7ab9e002-ef32-4e3e-b432-a420b0aaa507.png?resizew=158)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45fbffb9e2c7fa7c5006cde8da0cabe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a42de572d68ded125eccccc512c4fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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2023-10-10更新
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3卷引用:河南省周口市项城市第三高级中学2023-2024学年高二上学期第一次月考数学试题