如图,四棱锥
的底面是正方形,
平面
,
,
,点E是
上的点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/b39af73f-6fe9-4fb6-a766-3d91efb4ba20.png?resizew=136)
(1)若
平面
,求实数
的值;
(2)设直线
与平面
所成的角为
,直线
与平面
所成的角为
,是否存在实数
使得
,若存在,求
的值;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fb2e071d4e01107dcf7d95cbb86b415.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76b961aa27352c0ea54014325c96b5ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfda7a170c4a5b5e61b3e82e4ec30110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/defa5b53043ae802bb1af7d14374406d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5940069ecb7f22cca04d1d386af5def.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/b39af73f-6fe9-4fb6-a766-3d91efb4ba20.png?resizew=136)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3990084d5e0aa213dc6f069b630822.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
(2)设直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6581916f5a65edfea257c804efee007e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4065abc1e632862a82ab21496902458.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
更新时间:2021-01-09 21:42:03
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图,在长方体
中,
,点
在棱
上移动.
![](https://img.xkw.com/dksih/QBM/2015/3/10/1571994151534592/1571994157457408/STEM/81963cec5791438d925b0313d2bf6b23.png?resizew=190)
(1)证明:
;
(2)若
,求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ed1da7a28fb1983af25f2be2ed03cd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2015/3/10/1571994151534592/1571994157457408/STEM/81963cec5791438d925b0313d2bf6b23.png?resizew=190)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0fa81c1f81266b4ef3d471bc6bfc38d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/513bc90c620a5001ad5027d66597fc0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35988677892d6ffdf4773f7a861f26a4.png)
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解答题-问答题
|
适中
(0.65)
解题方法
【推荐2】斜三棱柱
的各棱长都为2,
,点
在下底面ABC的投影为AB的中点O.
(1)在棱
(含端点)上是否存在一点D使
?若存在,求出BD的长;若不存在,请说明理由;
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/171429a1afe5bb4ee4cb811af61b1365.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/19/0a2f152d-d587-48f1-8fa1-2099bbf6b86d.png?resizew=161)
(1)在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43c53cee325b734f115aef70efdae3dd.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
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解答题-证明题
|
适中
(0.65)
【推荐3】在直四棱柱
中,四边形
为平行四边形,
为
的中点,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/ec92376d-2d04-4903-8af2-e3b20d0c2eaa.png?resizew=157)
(1)求证:
平面
;
(2)求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1e7470887cb88bd78adcb68514354c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a74b4952ac58a5e3fa3f2de86024ef6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/ec92376d-2d04-4903-8af2-e3b20d0c2eaa.png?resizew=157)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d0492b25f10ae45c39f8e9838519259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bf9628142422a4884bd59538da6d312.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fed2f706801662432b68797e72647c6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4294ffdba16ae69fd03b13959d682aba.png)
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解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】如图,在多面体ABCDEF中,底面ABCD是正方形,梯形
底面ABCD,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/11b18a49-5743-43c4-817e-8c471459679c.png?resizew=167)
(Ⅰ)证明:平面
平面
;
(Ⅱ)求直线AF与平面CDE所成角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9367449a5847eade07e69f4feddcb027.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a3e598620671950ba89b85ab0c73b32.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/11b18a49-5743-43c4-817e-8c471459679c.png?resizew=167)
(Ⅰ)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf84ed033bd035c2fe7552badd5e447d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14eec658f69c267a70c1e8f9b744e282.png)
(Ⅱ)求直线AF与平面CDE所成角的大小.
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解答题-问答题
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适中
(0.65)
名校
【推荐2】如图,在四棱锥
中,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
.
![](https://img.xkw.com/dksih/QBM/2022/1/22/2900129606516736/2903690423599104/STEM/e855fe31-f188-457e-9dcb-8265b723a3af.png?resizew=200)
(1)证明:
平面
;
(2)在线段
上是否存在一点
,使直线
与平面
所成角的正弦值等于
?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a97186359ccaf3e110a9c0195c4dac7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/464c079d3fb0312aac21fa6fa5140414.png)
![](https://img.xkw.com/dksih/QBM/2022/1/22/2900129606516736/2903690423599104/STEM/e855fe31-f188-457e-9dcb-8265b723a3af.png?resizew=200)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd92f594c348f7a956607f7b381cc22a.png)
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【推荐3】如图,在四棱锥
中,底面ABCD为菱形,
,
,
,
,
,且
.
.
(2)若
,求直线PA与平面PBD所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4f5eec0addba78f2e0cdfb7ecc59a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4014edd5ca7ddd954507ab87eb2638e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c397bc7f7b3de2c8182c3fbe94fd5ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ade0c328cc3442c26e5bf33d9134c071.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/967acbdcaff72b127bc6b27afffefb04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f523d89b2aa3d1e97628c7c670eac13a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9829fc6685b59fdc609f32f30ebd9e6d.png)
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