如图,已知直三棱柱
的体积为
(其中底面三角形
为锐角三角形),
.
(1)求点
到平面
的距离;
(2)求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/639eea387338264cf53f62abb7624972.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/23/b264bd3d-edba-4957-95db-3c8a5b6ed544.png?resizew=144)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
2023·河北邯郸·模拟预测 查看更多[2]
更新时间:2023-12-30 15:04:21
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相似题推荐
解答题-问答题
|
适中
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解题方法
【推荐1】如图所示的多面体中,四边形
是矩形,
,△
,△
都是边长为2的正三角形,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeedb5f361a1baff6338436fff6c471d.png)
(1)证明:
平面
;
(2)求这个多面体的体积
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2194add18a7df1a23cf1554dc2da1b40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e51817ee1ebf17c73ed21171bcfc5b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeedb5f361a1baff6338436fff6c471d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/24/a8d72539-23d3-4c76-a26b-7dc5849f27c0.png?resizew=195)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求这个多面体的体积
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be54e84508decfcce6d2fcbe6c8c1a92.png)
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解题方法
【推荐2】已知平面向量中有如下两个结论:
结论1:若
、
是不共线的两个平面向量,
,则A、B、C三点共线的充要条件是
;
结论2:若
、
是不共线的两个平面向量,
,若点P在与AB平行的直线上,则
(
为定值).
将上述两个结论推广至空间向量(无需写出推广结论)解决以下问题:
已知
、
、
是两两垂直的单位向量,P是空间中一点.
(1)若
且
,求
的最小值;
(2)若
且满足
,求动点P的轨迹所围成的区域的体积.
结论1:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d60dcb171bb7fd972aab8294d63acdb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f68628a408537b1cf3bf1ca2a69731b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8d53f6d504fbd7e84bd250d9cc819b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6096acdd2d0ce16e1e45397ec5e365d4.png)
结论2:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d60dcb171bb7fd972aab8294d63acdb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f68628a408537b1cf3bf1ca2a69731b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59bca4c0ab83a3ca3b0ebf03281be74f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f43d4ea94af0d0aa04e48d63b66b61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
将上述两个结论推广至空间向量(无需写出推广结论)解决以下问题:
已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d60dcb171bb7fd972aab8294d63acdb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f68628a408537b1cf3bf1ca2a69731b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20ec3efaa6b6ff5769e8999df5714a9.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cc5c5670877248cec1f91e8d4eda25b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41289029ec05bbc71a61779e5ec273ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d52c684c9769a5105aa031d607328f9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cc5c5670877248cec1f91e8d4eda25b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/351b374b22054c647b5127d030739c8b.png)
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【推荐1】已知四棱锥
中
平面
,且
,底面为直角梯形, ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b31a77c7dfcec8a7b27afae5cd6d0f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aedfff40d31e4f98f223fd5834a57866.png)
分别是
的中点.
![](https://img.xkw.com/dksih/QBM/2013/3/23/1571158969155584/1571158974881792/STEM/a462c830-67cd-47e0-b372-e2eb8181f8bf.png?resizew=190)
(1)求证:
// 平面
;
(2)求截面
与底面
所成二面角的大小;
(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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72f9d7c0897decece12409432fc1191a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b31a77c7dfcec8a7b27afae5cd6d0f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aedfff40d31e4f98f223fd5834a57866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a211a44ffb09c7413dac58e9cea70fd9.png)
![](https://img.xkw.com/dksih/QBM/2013/3/23/1571158969155584/1571158974881792/STEM/a462c830-67cd-47e0-b372-e2eb8181f8bf.png?resizew=190)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2dca049735b45fb9b2533c68605eddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b60870baa5e3fbc33a749aa5f0a94be.png)
(2)求截面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/101d5eb54d3f629a378bfd5324f554dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/101d5eb54d3f629a378bfd5324f554dd.png)
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【推荐2】在四棱锥
中,底面ABCD为直角梯形,
,
,
,平面
平面ABCD,
,E为PA中点.
![](https://img.xkw.com/dksih/QBM/2022/11/19/3112966819782656/3114584576278528/STEM/88bae1f3da684e0db137fd859d6b2219.png?resizew=173)
(1)求证:
平面PBC;
(2)已知平面PAD与平面PBC的交线为
,在
上是否存在点N,使二面角
的正弦值为
?若存在,请求出PN的长;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3402ea855e2ae2dcd98f607bef4fdd6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec2d5ab801f2a84b78139b0ea2c5032b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8254b52b379a420c17d38334940b073.png)
![](https://img.xkw.com/dksih/QBM/2022/11/19/3112966819782656/3114584576278528/STEM/88bae1f3da684e0db137fd859d6b2219.png?resizew=173)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec47f6d6cb1eeefbb466e4fe71fd568c.png)
(2)已知平面PAD与平面PBC的交线为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5463f1d2616f917905790ae23226efd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24c14ff9b66f21c05e52dc3c8908c2df.png)
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解题方法
【推荐1】如图,在棱长为1的正方体
中,
为线段
的中点,
为线段
的中点.
(1)求点
到平面
的距离;
(2)求平面
与平面
所成锐二面角的余弦值.
![](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/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/28/14b3fc58-7c84-4448-a432-a0c958f70701.png?resizew=165)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db3ef97d64e58d311019b70fe5e2cc0d.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db3ef97d64e58d311019b70fe5e2cc0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8680cf2cce45555b864f08b75a71a7b1.png)
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【推荐2】如图,矩形
和梯形
,
,平面
平面
,且
,过
的平面交平面
于
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/21/560a4565-3629-4858-8a35-417b14667f3a.png?resizew=172)
(1)求证:
与
相交;
(2)当
为
中点时,求点
到平面
的距离:
![](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/ca7db45643a42a261d58214e6accbe8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c674dc5024374f53920947c4cf4baf11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62baf83ce124ffefb6c4cac49c29af16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/21/560a4565-3629-4858-8a35-417b14667f3a.png?resizew=172)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abe38c885f29722c433022c4b2ae6211.png)
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