如图,在四棱锥
中,四边形
是菱形,对角线
与
的交点为
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/19/29c0f9aa-0e8c-4aaf-8b35-747303168a6d.png?resizew=217)
(1)证明:
平面
;
(2)点
在棱
上,若体积
,求:
①
点的位置;
②
与平面
所成角的正切值.
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcbf0ecf8b70dcca43b9e67fd3083e45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c85aeab3aeaf4367b711da8cde2e8bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ec435aa1401dbce7863b531bf2f3e5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/19/29c0f9aa-0e8c-4aaf-8b35-747303168a6d.png?resizew=217)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e126c16032892966489053f44b9048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/499b9c860d55d51d4d1868cd40528668.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
21-22高三上·山西运城·期中 查看更多[2]
更新时间:2021-11-19 09:39:17
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图,长方体中
中,
,点P为面
的对角线
上的动点(不包括端点),PN⊥BD于N.
![](https://img.xkw.com/dksih/QBM/2021/10/19/2832962918006784/2833684082114560/STEM/695b8c39fe9644769b9c4cdbbcf554c0.png?resizew=209)
(1)若点P是
的中点,求线段PN的长度;
(2)设
,将PN表示为
的函数,并写出定义域;
(3)当PN最小时,求直线PN与平面ABCD所成角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b98a13eacfcc6743aa433d7674e18e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebb05874eb3353d754af24c9974273e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c09eec4e14a861af83d7828797d176.png)
![](https://img.xkw.com/dksih/QBM/2021/10/19/2832962918006784/2833684082114560/STEM/695b8c39fe9644769b9c4cdbbcf554c0.png?resizew=209)
(1)若点P是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c09eec4e14a861af83d7828797d176.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8711eddf26d11fc974dfb6da4b640918.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)当PN最小时,求直线PN与平面ABCD所成角的大小.
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【推荐2】四边形ABCD为矩形,AD⊥平面ABE,AE=EB=BC,F为CE上的点,且BF⊥平面ACE.
(1)求证:AE⊥BE;
(2)设M在线段AB上,且满足AM=2MB,试在线段CE上确定一点N,使得MN∥平面DAE.
(1)求证:AE⊥BE;
(2)设M在线段AB上,且满足AM=2MB,试在线段CE上确定一点N,使得MN∥平面DAE.
![](https://img.xkw.com/dksih/QBM/2018/4/17/1926138788306944/1929612414869504/STEM/0bd58fce43764289803bf9dc3995b8be.png?resizew=142)
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解答题-证明题
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适中
(0.65)
名校
【推荐1】如图,已知等腰梯形
中,
,
,
是
的中点,
,将
沿着
翻折成
,使平面
平面
.
平面
;
(2)求
与平面
所成的角;
(3)在线段
上是否存在点
,使得
平面
,若存在,求出
的值;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abfb2735e1683a6ae86b5b97a0032e4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/619e1e12cc9037b65ec7ee72160e9022.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad09a769a75b107390b9eeccc929f761.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f38a857b9fabe179c565feb88de4175.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7c60a0de546f75b46348265746aa707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6bfad3f7e65188bcf7f62ea5acdbf4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f30533da2e1d2a958dc906c37eba9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbee3d2962bee74bf65ad4e71bca155.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f1158eaa2e338f564eb18de5bef1d25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/257f33a7c02e440407ae57dc42de06e6.png)
(3)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3123da0313d458c833e82aaa234b9117.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efb87785b2842459c59b2571aac7374b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3324bc6bf263ca1feeaf1b61eddab330.png)
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解题方法
【推荐2】如图所示,已知长方体
中,
,点
是
的重心,
面
.
![](https://img.xkw.com/dksih/QBM/2021/6/30/2754282243809280/2762805000159232/STEM/e76cebc7-1dea-46a8-a3ba-dc8f36b42c0f.png?resizew=253)
(1)求
的长;
(2)求
与平面
所成角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1baa1c07becd03537beeb09a31745cf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe588d0242a4dd702b22913706eb528.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60dca6612daa81f3323d694d5339ea4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13cfdc6224181d44e63aab43ddaf07ef.png)
![](https://img.xkw.com/dksih/QBM/2021/6/30/2754282243809280/2762805000159232/STEM/e76cebc7-1dea-46a8-a3ba-dc8f36b42c0f.png?resizew=253)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b688a5c1b73cdace8ad20e08fae2342f.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13cfdc6224181d44e63aab43ddaf07ef.png)
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(0.65)
名校
【推荐3】如图所示,平面ABEF⊥平面ABC,四边形ABEF是矩形,AB=2,AF=
,△ABC是以A为直角的等腰直角三角形,点P是线段BF上的一点,PF=3.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/57a2d8c3-fd83-4f6a-96c5-5c0dd3f8927d.png?resizew=188)
(1)证明:AC⊥BF;
(2)求直线BC与平面PAC所成角的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/57a2d8c3-fd83-4f6a-96c5-5c0dd3f8927d.png?resizew=188)
(1)证明:AC⊥BF;
(2)求直线BC与平面PAC所成角的正切值.
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