如图,在四棱锥
中,四边形
是平行四边形,
平面
,
为
中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/5/5de731a0-8dc3-4946-bffc-9f5d02dfa874.png?resizew=157)
(1)求平面
与平面
夹角的余弦值;
(2)设点N在直线
上,若
的面积是
,求
的值.
![](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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64a28a3c67928bdc36505ce6cd3907c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b8e70aed4d5ad04f18119145d4c965c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/5/5de731a0-8dc3-4946-bffc-9f5d02dfa874.png?resizew=157)
(1)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fcce61c3d158b5331d6de10db3fb55d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf4c26f3f4d96117f087400a0f32ece8.png)
(2)设点N在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35fe4d4160c1b1c9bdb52cf72b451b0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4306d83186018024f1e40ea9a90af3cb.png)
更新时间:2024-03-06 07:36:16
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,四边形ABCD为直角梯形,BC∥AD,∠BAD=90°,BC=2,AD=3,四边形ABEF为平行四边形,AB=1,BE=2,∠EBA=60°,平面ABEF⊥平面ABCD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/1e7d9d8c-d21d-46ec-859f-aa07c7bb74f6.png?resizew=187)
(1)求证:AE⊥平面ABCD;
(2)求平面ABEF与平面FCD所成锐二面角的余弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/1e7d9d8c-d21d-46ec-859f-aa07c7bb74f6.png?resizew=187)
(1)求证:AE⊥平面ABCD;
(2)求平面ABEF与平面FCD所成锐二面角的余弦值.
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【推荐2】如图,四棱锥
中,
平面
,底面
是正方形,
,E为PC中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/ed9fe480-9258-401d-9486-91c3e577ee09.png?resizew=208)
(1)求证:
平面
;
(2)求二面角
的正弦值.
![](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/99926bf272cd757f0985c69b390ebcce.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/ed9fe480-9258-401d-9486-91c3e577ee09.png?resizew=208)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8d2d217e9bcd059908f117dfc4d4259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eaa13915786802de6a540d56dec821b.png)
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解答题-证明题
|
适中
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【推荐3】在如图所示的几何体
中,平面
平面
,四边形
和四边形
都是正方形,且边长为
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/27/938c0d9a-cd8d-4451-82c3-e8f1408f1b4f.png?resizew=214)
(1)求证:直线![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
平面
;
(2)求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf9a6db3571fa57bfa2d5e4d44c51b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/27/938c0d9a-cd8d-4451-82c3-e8f1408f1b4f.png?resizew=214)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29eb63c36ca248a27609c059fbc5400a.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed7a8116d2f02b52c33fb7a49fc0d1ae.png)
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解答题-问答题
|
适中
(0.65)
名校
【推荐1】已知点
和向量
,
.
(1)求点B的坐标;
(2)求原点O到直线AB的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a688a421bd7719acaa48ea95416a381b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40e68a30ae2029028ed285cbd65a6f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e7a93a1399ff7a2bde342652479241b.png)
(1)求点B的坐标;
(2)求原点O到直线AB的距离.
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解答题-证明题
|
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(0.65)
名校
【推荐2】如图1,在
中,
,
,
,
分别为棱
,
的中点,将
沿
折起到
的位置,如图2,连结
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/85e227a6-539d-453d-ba37-93e50ad08648.png?resizew=375)
(1)求证:平面
平面
;
(2)若
,若
为
中点,求点
到直线
的距离;
(3)若
,线段
上是否存在一点
,使面
与面
的夹角的余弦值为
?若存在,求出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cad3e2b2689dfe97ec82d473ab6cf469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9f8ec91ebf38b062920cbebce3e8be7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7acea3c19d0ff7d15fd0b1c9f38410db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884b508394b3ab50734b584d9ec783c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1cbf03524f866cc66d019a01e7c4284.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a675310c8ba418e5a59beb7317e21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/85e227a6-539d-453d-ba37-93e50ad08648.png?resizew=375)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860c4c9419ebfa927b3f3ea14e4f4784.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860c4c9419ebfa927b3f3ea14e4f4784.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9150bd9ff61dd891483fa1d885c7bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a69d166677557cadb3da32b4a7e152e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf3b1771fbc438ff888bd28bb1dadcee.png)
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