如图,在直三棱柱
中,
,
,
,
,
分别为
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/868f43a7-403d-4cfa-a899-1edba41d17c9.png?resizew=172)
(1)求证:
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d72a12c950049438201afb62028d8fbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/868f43a7-403d-4cfa-a899-1edba41d17c9.png?resizew=172)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b757706eee506a078fc25e3f33a70cb.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
更新时间:2021-12-23 19:36:25
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【推荐1】已知空间三点
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a657064100d64cd9dd5894ca36a2dfc.png)
,设
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【推荐2】判断下列每对向量是否垂直:
(1)
,
;
(2)
,
;
(3)
,
;
(4)
,
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/649ff752a0482efc7aa5afe3138e2d53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a115b6c77a0725c2a2ed1fddf27272bd.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/962f8bb57a9e54d5790a393ee7f14293.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a115b6c77a0725c2a2ed1fddf27272bd.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db9496c906229f7563cb0d63251c0534.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e3ff7d30f1aea08808ace82cf0e5c5.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af3ee991d6eade91b32e7f49dfaaf824.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829127b6dc768f01db67add8b3354325.png)
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解答题-证明题
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名校
【推荐1】如图,在四棱锥
中,
底面
,
,底面ABCD为直角梯形,
,
,
,点E在棱PA上,且
.
(1)证明:
平面EBD;
(2)求直线PD与平面EBD所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45fbffb9e2c7fa7c5006cde8da0cabe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e4d9fa7e010cefd80948f217eef9c7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/457c2ee2c0139622d2e5de9a51c106b6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/30/6afb7a6a-d53b-4157-a4c6-e6c97e839a61.png?resizew=149)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2597b5554284e275367c25529c6750f.png)
(2)求直线PD与平面EBD所成角的余弦值.
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解题方法
【推荐2】如图,正方体
的棱长为2,点
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/920f9b63-8423-4537-8216-bd9417fb0495.png?resizew=169)
(1)求直线
与平面
所成角的正弦值;
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/920f9b63-8423-4537-8216-bd9417fb0495.png?resizew=169)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59375dfae3a8ec264204cfe78caac97d.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59375dfae3a8ec264204cfe78caac97d.png)
您最近一年使用:0次
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(0.85)
【推荐3】如图,在四棱锥
中,
面
,
,
,
,
,
,
分别为
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/8/7dedbd82-f49e-4d5e-9443-436af195600a.png?resizew=153)
(1)证明:
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/8/7dedbd82-f49e-4d5e-9443-436af195600a.png?resizew=153)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1384ffba86ff08ce9e783d5d1bc51686.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
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