如图,四棱锥
中,底面
为矩形,
平面
,
,
分别为
,
的中点,
与平面
所成的角为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/17dd988e-3d14-4930-b41a-d67e9e6f154d.png?resizew=170)
(1)证明:
为异面直线
与
的公垂线;
(2)若
,求二面角
的余弦值;
(3)在(2)的条件下,棱
上是否存在点
,使得
与平面
所成的角为
?若存在,写出
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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10c83f8945042b9c8fb2fbdac9308d62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c2bc5e50b8dfa02601c70822252854a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e5fa72f2878b476bc57f0df12d6555.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/17dd988e-3d14-4930-b41a-d67e9e6f154d.png?resizew=170)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c2bc5e50b8dfa02601c70822252854a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a4c9a32fe02c162f0521a0a01be263e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c53f1e79257ff52a0408fdc482488d0.png)
(3)在(2)的条件下,棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c2bc5e50b8dfa02601c70822252854a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5885ebe4cc091ac2085df704ef9c0bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e22577047d263c1ddf9081938520596.png)
20-21高二上·辽宁·期中 查看更多[2]
更新时间:2021-07-15 07:04:29
|
相似题推荐
解答题-证明题
|
适中
(0.65)
解题方法
【推荐1】如图,在正方体
中,正方体的棱长为2,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/162d8817-3545-4032-8bc9-e3044449f5be.png?resizew=182)
(1)求证:
;
(2)求直线
与平面
所成角的正弦值;
(3)求
到平面
的距离.
![](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/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/162d8817-3545-4032-8bc9-e3044449f5be.png?resizew=182)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95acc4df88e4fd0d38cf4a64f16d2dc4.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2331bccb6ebf5b9fd639df994f575a9.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2331bccb6ebf5b9fd639df994f575a9.png)
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【推荐2】在平面向量中有如下定理:已知非零向量
,
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/715424930a93f29dd7e0ade85d782abb.png)
(1)拓展到空间,类比上述定理,已知非零向量
,
,若
,则___
请在空格处填上你认为正确的结论![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
(2)若非零向量
,
,
,
且
,
①利用(1)的结论,求当
时,求
的值,
②利用(1)的结论,求当k为何值时,
分别取到最大、最小值?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21622782a1b33b3be43d7824ac5f1c82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7917464c0138a5fde64680a966573f31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7dced91de1b8c38aa95ffee0e5dc202.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/715424930a93f29dd7e0ade85d782abb.png)
(1)拓展到空间,类比上述定理,已知非零向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3619a3f526eca4e29fd3edc6bd485f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8383f8f4d22147a863c687f7c99798d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7dced91de1b8c38aa95ffee0e5dc202.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a301324443eb93b467134a86890dd9ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
(2)若非零向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80ea38931261a942bed5fdaee83a75c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b9503aadc76a4d1662b7ee9641b42dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0b9fa4da98bf9cc404ca1ef8fed6add.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a36228810d0c2f6c6e53584c1ac176b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cc523bdaf222089feb5befd43753ed7.png)
①利用(1)的结论,求当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a882037b9ce104ecc496e0f31a139361.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b6859d25bbd00d4f12ffa02e87c51d.png)
②利用(1)的结论,求当k为何值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b6859d25bbd00d4f12ffa02e87c51d.png)
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【推荐1】如图,在四棱锥P一ABCD中,已知
,点O为AC中点,
底面ABCD,
,点M为PC的中点.
![](https://img.xkw.com/dksih/QBM/2020/1/7/2371860647395328/2371906251923456/STEM/bfddf60e92054bf2b08212b1667d76c5.png?resizew=265)
(1)求直线PB与平面ADM所成角的正弦值;
(2)求二面角D-AM-C的正弦值;
(3)记棱PD的中点为N,若点Q在线段OP上,且
平面ADM,求线段OQ的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/967017025fdb758a7311b0394927de18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e126c16032892966489053f44b9048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae890f9e8b32aa53a54158f24f4a87bc.png)
![](https://img.xkw.com/dksih/QBM/2020/1/7/2371860647395328/2371906251923456/STEM/bfddf60e92054bf2b08212b1667d76c5.png?resizew=265)
(1)求直线PB与平面ADM所成角的正弦值;
(2)求二面角D-AM-C的正弦值;
(3)记棱PD的中点为N,若点Q在线段OP上,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a19ca7d695e7e254d4fa0342a01aba.png)
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【推荐2】在四棱锥
中,
平面
,
,底面
是梯形,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/15/e1129109-dd52-4c75-a2e4-a26ab21962ee.png?resizew=188)
(1)求证:平面
平面
;
(2)设
为棱
上一点,
,直线
与面
所成角为
,试确定
的值使得
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5dd496ee0c1170ef6dcc48266ee444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/218054144a13435580cd132b9459546c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f9425630dcfe5a824c44904d4f71e13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68d31600cba2d5256c7e78b6122d6755.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16114c73382b18f060150f2ab1f1484d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/15/e1129109-dd52-4c75-a2e4-a26ab21962ee.png?resizew=188)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78a3fd5284e160896f07ce367645fd04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ba7a4f5ec17e1792c9a7ed23349bbbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/750303cc97d19b55b5acbc9f162909c2.png)
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解题方法
【推荐1】长方形
中,
,
是
中点(图
),将
沿
折起,使得
(图
)在图
中
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/30/d3b15c89-b286-4537-ac9f-b476d8cb2362.png?resizew=319)
(1)求证:平面
平面
;
(2)在线段
上是否存点
,使得二面角
的余弦值为
,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c4e4a162f12d12a082b8d8fdd1aeab9.png)
![](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/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7f9fba8a4098c1a0515286eb8d616dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/804c0e2a375b5f4ff1c420532968efc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/30/d3b15c89-b286-4537-ac9f-b476d8cb2362.png?resizew=319)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bb5012f6c70a1e98d682b6d021fadd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0760712e3e2ea02b755b751e760d0c55.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a5266895d3c1fcb350a745bc779433b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee14db57f0c762aad845cf5b4a243c0.png)
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【推荐2】如图所示,在多面体
中,底面
为矩形,且
底面
∥
.
(1)证明:
∥平面
.
(2)求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad0591515beabb21e67a791e736774f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a28d6477c85c5a4ac410a884e92fbe53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4c3f9dd5d0343597a7f58a1989b537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6848fee099124c81bf38006cf09d563.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f6fc14846b0eae51d8de30c0594641c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/22/0972d4c8-e699-4fd1-b983-99447549b360.png?resizew=153)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7090ad13cf3664c89cdb2288779a9669.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc83f34b5a3c1dc09d990ce4bdc8e078.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7090ad13cf3664c89cdb2288779a9669.png)
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解题方法
【推荐1】如图,底面为直角梯形的四棱柱
中,侧棱
底面
,
为
的中点,且
为等腰直角三角形,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/23/c53259b8-df6b-4191-a191-65bd6aabf832.png?resizew=182)
(1)求证:
;
(2)求直线
与平面
所成角的正弦值;
(3)线段
上是否存在点
,使
平面
?若存在,求出
;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d572fdea0ba4336ccf77c76db7f0332.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e40ab043fbfa212812d35d4f731aef7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbf9194bd849f2648721a4d0222a375e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/23/c53259b8-df6b-4191-a191-65bd6aabf832.png?resizew=182)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9874eca4abea481fa84eb772a920f9c7.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
(3)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1642eec556eb252de9c1ab7bb5ca90b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356f46276f25c78bab48c1f9447a2a78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/128c69eb81dae89c6989d06d20925ad2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c38757c4b09eddb4b0f3c472f4d90626.png)
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名校
解题方法
【推荐2】在
中,
,
,
,
、
分别是线段
、
上的点,满足
且
,将
沿
折起到
的位置,使
,
是
的中点,如图所示.
![](https://img.xkw.com/dksih/QBM/2022/1/18/2897386477322240/2945788897869824/STEM/4232c9d429d049f1badedf9d4065d8e8.png?resizew=464)
(1)求
与平面
所成角的大小;
(2)在线段
上是否存在点
(
不与端点
、
重合),使平面
与平面
垂直?若存在,求出
与
的比值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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(1)求
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(2)在线段
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