如图,在正三棱柱
中,
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/26/c52e064b-a853-4880-bd60-f694520b0464.png?resizew=148)
(1)证明:
;
(2)求平面
与平面
的夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92105835f8075cb75dff244e908370b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/26/c52e064b-a853-4880-bd60-f694520b0464.png?resizew=148)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5b0bfe1e7a956345f7ed58a3b2faa70.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935fe3125f247b7bea4f065ce9ad985.png)
更新时间:2023-12-26 09:55:08
|
相似题推荐
解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】在直棱柱
中,点
为棱
的中点,底面
为等腰直角三角形,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/06483254-d810-4c3f-9f0c-81b366f98ce4.png?resizew=145)
(1)证明:
平面
;
(2)若
,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a696a182fff038a86b2bbe8ca099442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42066e0ef0cb9012bc93b6cfe978c80b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/06483254-d810-4c3f-9f0c-81b366f98ce4.png?resizew=145)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5928c98b341b16d4b5a5b931d2929d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dddfef906818cc8ddd00f867b77f227.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a935b7d21a103a264b6e96ecf82dbe4a.png)
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
解题方法
【推荐2】如图,在四棱锥
中,底面
为梯形,
,
,
,
,面
面
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/2020/4/4/2434431122825216/2435486369980416/STEM/770bbd681de243fba2a54251beda9533.png?resizew=246)
(1)求证:
;
(2)在线段
上是否存在一点
,使得
面
?若存在,请证明你的结论;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/411b38a18046fea8e9fab1f9f9b80a5f.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/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ab8dd48fd4f50850fa87a5d80287a22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.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/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/2020/4/4/2434431122825216/2435486369980416/STEM/770bbd681de243fba2a54251beda9533.png?resizew=246)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b07e317ffe7859e81b42ef4970e344a.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/963a91995abd4927d75406d16e10a81f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/360675bb72d0686257535c51e3ed1812.png)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
名校
【推荐1】如图,在四棱锥
中,四边形
为直角梯形,
,平面
平面
.
![](https://img.xkw.com/dksih/QBM/2022/7/7/3017592500305920/3018348687138816/STEM/59ff81f259c14dacaf80874fbe2a244b.png?resizew=147)
(1)证明:
.
(2)若四棱锥
的体积为
,求平面
与平面
所成的锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93778ab3bd07003cbccc1ff178af34c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f2a6ca3d272682f6b5d95355faee694.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed0d87ec827782188861e0e7724193b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a2c29334a175f374b12c459206b2e75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acae105cb79ff87a7790dbe9e6fd7fac.png)
![](https://img.xkw.com/dksih/QBM/2022/7/7/3017592500305920/3018348687138816/STEM/59ff81f259c14dacaf80874fbe2a244b.png?resizew=147)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/736eca86008d535f03500d32ac00cd46.png)
(2)若四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93778ab3bd07003cbccc1ff178af34c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/802e162b98c280720fcb909cf392fda3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf2f0df53aa68c9c334165034788166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2db1674add0f4a1a24f5ed893b1c5d0.png)
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
【推荐2】如图,斜三棱柱
中,侧面
为菱形,底面
是等腰直角三角形,
,
C.
![](https://img.xkw.com/dksih/QBM/2018/6/27/1976317272956928/2019672559525888/STEM/b15193ec16504513bbaa07dfb7b856df.png?resizew=185)
(1)求证:直线
直线
;
(2)若直线
与底面ABC成的角为
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80969d2b85b57d776a482dde2df0f5a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1389bb27042ac1ab8eebaa16bc766baf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/882589c896c6993d9687f0e14a283481.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fd84de828fe646996ba099b6ecf14a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/346d6358a51a7c17b7c0699bb223d777.png)
![](https://img.xkw.com/dksih/QBM/2018/6/27/1976317272956928/2019672559525888/STEM/b15193ec16504513bbaa07dfb7b856df.png?resizew=185)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/161bc8727a789e42bf3f21f401d231b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a576a63dac3779b1c053145133e4e90.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a576a63dac3779b1c053145133e4e90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fe8dc472dade6cea6943164792ab532.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a459c865792728ccff5f8985a56223.png)
您最近一年使用:0次
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名校
【推荐3】已知如图①,在菱形
中,
且
,
为
的中点,将
沿
折起使
,得到如图②所示的四棱锥
,在四棱锥
中,求解下列问题:
![](https://img.xkw.com/dksih/QBM/2021/10/15/2830043570380800/2833513853394944/STEM/fe8bccf6-4edd-4833-b916-9910d72c09b8.png?resizew=482)
(1)求证:
;
(2)在线段
上是否存在一点
,使得平面
与平面
夹角的余弦值为
?若存在,请求出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a88c44f558705de3bcefcfc0ece96b8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5164a3cc47e266446d49127e2ef10c37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5164a3cc47e266446d49127e2ef10c37.png)
![](https://img.xkw.com/dksih/QBM/2021/10/15/2830043570380800/2833513853394944/STEM/fe8bccf6-4edd-4833-b916-9910d72c09b8.png?resizew=482)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8af620f6d204d310d8e3f267fdd6c3f8.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1985174e05ad371e13cf24d244423da4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dac9bf5ac3d89d6847a585bf318b3ba8.png)
您最近一年使用:0次
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适中
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【推荐1】四棱锥
中,底面
为正方形,
,
面
,
分别为
的中点,直线
与
相交于O点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/2/34a0436b-d522-48c4-8eb9-2eda685c9d7a.png?resizew=159)
(1)证明:
平面
;
(2)求直线
与平面
所成角的正弦值;
(3)求平面
与平面
所成角的余弦值.
![](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/f83a04565a8ebaa111894b724b0ba266.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/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0d87f681c57a2e1fd7efead6280a3f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/2/34a0436b-d522-48c4-8eb9-2eda685c9d7a.png?resizew=159)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30067b7b236d17af8a462f96a58d11bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
(3)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b7c70f0668aa9683f08b021bc219d05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/862efecdb6efec5e9ecb73c7230e84e3.png)
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
名校
解题方法
【推荐2】如图,
垂直于梯形
所在平面,
,
为
中点,
,
,四边形
为矩形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/21/52a4c523-128d-4069-9b42-1ebf9b8926fe.png?resizew=166)
(1)求证:
平面
;
(2)求二面角
的大小;
(3)在线段
上是否存在一点
,使得
与平面
所成角的大小为
?若存在,求出
的长;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deeb439906f6d463c9594b41bc4a9172.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbe7a201432af0a2f9d21c6803906f5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0046177466c78f08d45449dc5639bf38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5bf51c07144386bd23a422d9ceb140.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/21/52a4c523-128d-4069-9b42-1ebf9b8926fe.png?resizew=166)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f81fa367ec317fe2a30142e1c30cce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5a2fd95dfda3f70bc2d9fcd8380bf99.png)
(3)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1b489c25405ce48699d4f0a62820bed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632917e61f4208959686d118c7f19231.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐3】如图,在平行四边形
中,
°,四边形
是矩形,
,平面
平面
.
![](https://img.xkw.com/dksih/QBM/2018/4/27/1933230419992576/1936078144675840/STEM/71c9f549c1a64923a2141a8649937a46.png?resizew=193)
(1)若
,求证:
;
(2)若二面角
的正弦值为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f856b47cd25e16adfa0300e6656e5963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7276c8cb30fa88e89e9132b0d9b5df3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44b9fb616a125f49b4b68057c62aa80c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ea17579f46176911c40e5722bf6779d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/2018/4/27/1933230419992576/1936078144675840/STEM/71c9f549c1a64923a2141a8649937a46.png?resizew=193)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1403dae722e3a9fb6c90c5bffd89b28.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a34e44c5d7e1d22521fb293994f5b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7686c185cc2a20dac8f416957cddcfe7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b331bbdd68d110681fc4547748b93bb.png)
您最近一年使用:0次