如图,四棱锥
中,
平面
,底面四边形
为矩形,
,
为
中点,
为
靠近
的四等分点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/c24d5484-f3e8-488f-aa2d-8dd42d4de9ff.png?resizew=163)
(1)求证:
平面
;
(2)求异面直线
和
所成角的余弦值:
(3)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5203b16524b496a7272b5735aad23ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22ae3a464eb368b41fd4a86c88676c78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/c24d5484-f3e8-488f-aa2d-8dd42d4de9ff.png?resizew=163)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45fbffb9e2c7fa7c5006cde8da0cabe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1885efcff0b903e314057dd153578600.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
(3)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1885efcff0b903e314057dd153578600.png)
更新时间:2023-12-27 18:26:14
|
相似题推荐
解答题-问答题
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适中
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【推荐1】如图,在直四棱柱ABCD-A1B1C1D1中,底面四边形ABCD为菱形,E,F分别为AA1,CC1的三等分点(
).(用向量法解决下列问题)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/eab8a0e8-e782-48ec-8b46-616dd603f4cd.png?resizew=200)
(1)证明:B,F,D1,E四点共面;
(2)若AB=4,∠BAD=60°,求点F到平面BB1D1的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/102b69e08cfbf349e3f432ebf8088cd0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/eab8a0e8-e782-48ec-8b46-616dd603f4cd.png?resizew=200)
(1)证明:B,F,D1,E四点共面;
(2)若AB=4,∠BAD=60°,求点F到平面BB1D1的距离.
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【推荐2】如图,在三棱柱
中,
平面
,
,
,
,点
分别在棱
和棱
上,且
,
为棱
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/56aadd39-4ec0-4174-99fb-551d4a700de8.png?resizew=181)
(1)求证:
;
(2)求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a8bfe2553e852df73185d017c0a62fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/209acf15985d1ea1ad86fc4a37e38c0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d8cb98c0adee7ca698d8b17dacb845b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.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/f325add6b8a2f59117aef3481b181102.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/56aadd39-4ec0-4174-99fb-551d4a700de8.png?resizew=181)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8973bcb7d87303a0b5fba04a801019b9.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06ba7618f19ebc98e2e55656fd9ebf64.png)
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【推荐1】如图所示,四棱锥
的底面是矩形,
,
,且
底面
,若边
上存在异于
的一点
,使得直线
.
(1)求
的最大值;
(2)当
取最大值时,求异面直线
与
所成角的余弦值;
(3)当
取最大值时,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06319c8bb86ae5a4aa5958b013e8b648.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dc53b48b66d338cc4976c2c01c14bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10c83f8945042b9c8fb2fbdac9308d62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab609a6574633ebabcff3e73fa862081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41ba0ddcffcbc270daef181d99886907.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/7/020cc44a-7fe4-48a4-8750-9f0fb2e1a89f.png?resizew=172)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/defa5b53043ae802bb1af7d14374406d.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ef796b46e68fe77b117ff0483d2370c.png)
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解题方法
【推荐2】如图所示,在五面体
中,
平面
为
的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/ff1ba2f0-6b92-4cf4-aaa7-3686a1590847.png?resizew=169)
(1)求异面直线
与
所成角的大小;
(2)求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/147e7c8ba0bbb540a712f6eb2ed6d22e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f88ae7292a21c8d4b5ce14d8a93d65a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddb9d3036c9c020760c7cbc90061c52f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/ff1ba2f0-6b92-4cf4-aaa7-3686a1590847.png?resizew=169)
(1)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
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解答题-问答题
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适中
(0.65)
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【推荐1】在长方体
中,
,过
三点的平面截去长方体的一个角后,得到如图所示的几何体
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/e2053f36-731e-49f4-9a18-376bc547016c.png?resizew=157)
(1)若
的中为
,求异面直线
与
所成角的大小(结果用反三角函数值表示);
(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/10960e28df00dd6025b679920642b0c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98683f96b0d1ae96ae772e1088f5042b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52eab6de89f4d4e69650e94e0968744.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/e2053f36-731e-49f4-9a18-376bc547016c.png?resizew=157)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91b3920d41295bb20983cd9945cb18f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394c5d2f55221975503be8aa18022480.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9539f8fb13345b449274b67bbda995db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
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解答题-证明题
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【推荐2】如图,在四棱锥
中,底面
为平行四边形,侧面
是边长为2的正三角形,平面
平面
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/20/eba2624c-efd2-4e6e-8ed1-4bbd799caaf0.png?resizew=216)
(1)求证:平行四边形
为矩形;
(2)若E为侧棱PD的中点,且点B到平面ACE的距离为
,求平面ACE与平面ABP夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c583493109d50c9e4634c05e9042a9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/20/eba2624c-efd2-4e6e-8ed1-4bbd799caaf0.png?resizew=216)
(1)求证:平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若E为侧棱PD的中点,且点B到平面ACE的距离为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
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