在直三棱柱
中,D,E分别是
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/19/d0908c26-29dd-4b06-b6d0-5cd83b2a2a2e.png?resizew=142)
(1)求证:
平面
;
(2)
,
,
,求二面角
的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/19/d0908c26-29dd-4b06-b6d0-5cd83b2a2a2e.png?resizew=142)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d850305485a6d3ee30fe313dc8bb736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73845d4d663b3de0b281611fe2c762fe.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7ad3a578f403b9e6b97fa2dc955fc11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21ea52361458ce2e49ed0fe99d8e6c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92535536bd3c2761724fd058427f95a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/108fc9e3f7116ef24f7dafdd1a83e160.png)
更新时间:2023-12-19 11:54:11
|
相似题推荐
解答题-证明题
|
适中
(0.65)
解题方法
【推荐1】如图,在直三棱柱
中,
为
的中点,平面
与平面
的交线为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/3/83b59009-d904-4060-bf9e-1f6f099530a3.png?resizew=165)
(1)求证:
平面
;
(2)若
,
,
,
,直线
与平面
所成角为
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.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/db3ef97d64e58d311019b70fe5e2cc0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99b16cff607cdc2d69afc70dc778acbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/3/83b59009-d904-4060-bf9e-1f6f099530a3.png?resizew=165)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23976db53f05b3d5d791c4d736a7184d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99644f0e0881bc7bf383a88eb92c0949.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6db57eca2a7cbd91bc57372592580a76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f121eabff3c62c1a196d9ca5f6f83f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96c9eb310d9d90592d7ea635e3e06bb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99644f0e0881bc7bf383a88eb92c0949.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9399c9a2a31b0e3165aea2d6ccc4f7c9.png)
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【推荐2】如图,空间几何体
,△
、△
、△
均是边长为2的等边三角形,平面
平面
,且平面
平面
,
为
中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/d20f9d0d-bcc2-4cfe-90af-c3a077c123be.png?resizew=147)
(1)证明:
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8257b6bd25104e07b9ad935c0a3aac4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17580410bf63dba4fe164265afaac4cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14172212b7b34eaf967c5a72233621c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/d20f9d0d-bcc2-4cfe-90af-c3a077c123be.png?resizew=147)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebc26eda15abd72b7efe68af47639a5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5617a404c5a3356753136e5a6b6d51e5.png)
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解答题-证明题
|
适中
(0.65)
【推荐3】在平行六面体
中,已知
为平行四边形
的中心,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/28bfd065-b0dc-4004-974a-6612642f9af7.png?resizew=234)
(1)求证:
平面
;
(2)若
在平面
上的射影为四边形
的中心,
,
,
,求平面
与平面
所成二面角(平面角不大于
)的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2bf9ef324f1289e205e29fed105c38e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/28bfd065-b0dc-4004-974a-6612642f9af7.png?resizew=234)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3a04ea8ebc597fd1f5d6bb8df181a2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/299fe914d64f3a06f9b641d5591fc47a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e902ef81301bf5fd07e280c7bf37a034.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e13c772461aef1d9d715129636739748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a83c0b8db2205a6815811aa4ff5390f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ad72d7565699d1ebb741eb0ce12bac.png)
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名校
【推荐1】如图,已知
平面
是正三角形,
.
![](https://img.xkw.com/dksih/QBM/2018/10/10/2050723623747584/2052752350191616/STEM/63336e7985914f1db9aa595de0ff4f55.png?resizew=181)
(1)求证:平面
平面
;
(2)求二面角
的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fde5b9b07b288a63f8202b11a5e7413.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f779e7f5f53e4377b9a0a8e945d562.png)
![](https://img.xkw.com/dksih/QBM/2018/10/10/2050723623747584/2052752350191616/STEM/63336e7985914f1db9aa595de0ff4f55.png?resizew=181)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d28c625d7ac6878957facc8274d459c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/370148e9147aa25c60a07ab4ad46e83d.png)
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解题方法
【推荐2】在三棱柱
中,
,
,
,点
为棱
的中点,点
是线段
上的一动点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/73e1c558-4456-47ae-9d27-16a2977a04d4.png?resizew=184)
(1)求证:
;
(2)求平面
与平面
所成的二面角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d399572bdc5816897500121034d1100c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a9867622b25a1bb28458f8e298d0c9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe7a5ef399924dd3e3f8d8adb15c96a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/73e1c558-4456-47ae-9d27-16a2977a04d4.png?resizew=184)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9630289cb39f865fc40e47c65383e784.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f96c673a2381f118ea2d3efc0bca1f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e53b212640dadf751ef7f65a78a209.png)
您最近一年使用:0次
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|
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(0.65)
名校
【推荐3】如图,三棱锥
中,
,
,
为正三角形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/20/fce45307-9d71-42a5-ab83-5a991a4e30f7.png?resizew=164)
(1)证明:
;
(2)若平面
平面
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f86c589939053ce21ce0a67cf40054a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/20/fce45307-9d71-42a5-ab83-5a991a4e30f7.png?resizew=164)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a15a004f7d47ed595f063e60075223a.png)
(2)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b796bbaeb8450404c2d146283562006e.png)
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解题方法
【推荐1】刍甍,中国古代数学中的一种几何体.中国传统房屋的顶部大多都是刍甍.《九章算术》中记载:“刍甍者,下有袤有广,而上有袤无广.刍,草也.甍,屋盖也.”翻译为“底面有长有宽为矩形,顶部只有长没有宽为一条棱.刍甍字面意思为茅草屋顶”.如图下面的五面体为一个刍甍,其五个顶点分别为A,B,C,D,E,F,四边形ABCD为正方形,
,
平面ABCD,
,
,平面
平面ABCD,O为BC中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/050f4d5f-ec4e-4bf5-aea4-82d76fc4e4f5.png?resizew=177)
(1)求证:
平面
;
(2)求平面
和平面
所成的锐二面角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4901a7eda97d6a307db76c4fb196ba3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44a5a1579e41e7404e97d535297102aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd2d28f1e7a6b17401c19c34beddcbe0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/050f4d5f-ec4e-4bf5-aea4-82d76fc4e4f5.png?resizew=177)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9de7ea432599108b34a0ccaa0f2c75e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a09d9d486b7f91ba933210dd013a7f2c.png)
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真题
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【推荐2】如图,正方形ABCD的中心为O,四边形OBEF为矩形,平面OBEF⊥平面ABCD,点G为AB的中点,AB=BE=2.
(Ⅱ)求二面角O−EF−C的正弦值;
(Ⅲ)设H为线段AF上的点,且AH=
HF,求直线BH和平面CEF所成角的正弦值.
(Ⅱ)求二面角O−EF−C的正弦值;
(Ⅲ)设H为线段AF上的点,且AH=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
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