如图,在直三棱柱
中,
,
,
,M是
的中点,
.
![](https://img.xkw.com/dksih/QBM/2022/1/19/2897962735919104/2901567105597440/STEM/a060ba6e-b724-46b5-8db2-fd4b3170d650.png?resizew=151)
(1)求
的长;
(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/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267880e605306851d8f46be77b11f9c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c279c8033acb94c3f91be2e05b0a6bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30c7c9b452fba2c98370cd2cf692aceb.png)
![](https://img.xkw.com/dksih/QBM/2022/1/19/2897962735919104/2901567105597440/STEM/a060ba6e-b724-46b5-8db2-fd4b3170d650.png?resizew=151)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
2022·重庆·一模 查看更多[4]
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更新时间:2022-01-24 21:16:17
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,三棱锥
中,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/74bc1ee7-06c0-4723-87f0-0115ef232b1b.png?resizew=182)
(1)求证:
;
(2)求
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a9b8e7befcb7881c294070175b1a554.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b94d1563aaaef62c1643614a732931e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080ca48cd27d4bf9d9ef084b558fc17a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eea78bf026d76f1cb9cc3dc9349a193.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/74bc1ee7-06c0-4723-87f0-0115ef232b1b.png?resizew=182)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bafa8c14100a4f847b41b9148954116c.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
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解答题-证明题
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适中
(0.65)
名校
【推荐2】如图,在四棱锥
中,底面
的边长是
的正方形,
,
,
为
上的点,且
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/c69bab56-807b-4693-bdc4-d82dfb2f7e74.png?resizew=172)
(1)求证:平面
平面
;
(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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62974d34de3a12418d6b700420afd1b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0453cfd7e92bf7746a88280b9e7b580.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a22d6b860f06fe23618b0d3de6768fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/c69bab56-807b-4693-bdc4-d82dfb2f7e74.png?resizew=172)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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解答题-问答题
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适中
(0.65)
【推荐3】在如图所示的四棱锥
中,底面ABCD是平行四边形,点E,F分别在棱AB,PC上,且满足
,
.
平面PAD;
(2)若平面
底面ABCD,
和
为正三角形,求直线EF与底面ABCD所成角的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee40331e3822e30af2e34515e7eeed9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5557246ca5d25d82330631afda327feb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7a407b262c22419f73396170ecdc849.png)
(2)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/342d452a7b850cd3a15b23619ad39bd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/177678001b2ccde1db8f57fa5e017002.png)
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解答题-证明题
|
适中
(0.65)
名校
【推荐1】已知四棱锥E—ABCD中,四边形ABCD为等腰梯形,AB∥DC,AD=DC=2,AB=4,△ADE为等边三角形,且平面ADE⊥平面ABCD.
![](https://img.xkw.com/dksih/QBM/2021/3/17/2680085557600256/2683383448084480/STEM/a3679f114d5148f8bda619f518f2ae7b.png?resizew=244)
(1)求证:AE⊥BD;
(2)是否存在一点F,满足
(0<
≤1),且使平面ADF与平面BCE所成的锐二面角的余弦值为
.若存在,求出
的值,否则请说明理由.
![](https://img.xkw.com/dksih/QBM/2021/3/17/2680085557600256/2683383448084480/STEM/a3679f114d5148f8bda619f518f2ae7b.png?resizew=244)
(1)求证:AE⊥BD;
(2)是否存在一点F,满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a851f35bc40c8e1fb53eba8b16c1de85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b7f6d52ea5a83394b3093ddb1e3b44c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图
,菱形
的边长为
,
,将
沿
向上翻折,得到如图
所示得三棱锥
.
(1)证明:
;
(2)若
,在线段
上是否存在点
,使得平面
与平面
所成角的余弦值为
?若存在,求出
;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff5a86745bfe1dfe7bc2683811210330.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eeb4c6e9a723aa843e6ba62d7c1a3a6c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/21/017f48fd-7480-446f-8191-d4d29f2274d8.png?resizew=258)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b219a74a1ce5a2b22c36d8de1e21ff91.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f89d82e9eb9b5d65306aac5de81460f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d254a2f50de801bba567dc4f04a9d87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3aace91caec728e174daec29a3568ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
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