如图,已知直角梯形
与
,
,
,
,AD⊥AB,
,G是线段
上一点.
![](https://img.xkw.com/dksih/QBM/2023/7/18/3283445665742848/3285844506075136/STEM/55ef0b66757e4459b1b28064f943f7c0.png?resizew=155)
(1)平面
⊥平面ABF
(2)若平面
⊥平面
,设平面
与平面
所成角为
,是否存在点G,使得
,若存在确定G点位置;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/3ecc1cb55a57dde481f8dd07ab150676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e17cc589a40a0a4c4319ebdfa866c69c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a47dcb24ffe20e8153e0d113ff8bee3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dfc9857ec7c679421b2172b345276ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae1e04eeb4de72e5750dae77bcb6f88a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://img.xkw.com/dksih/QBM/2023/7/18/3283445665742848/3285844506075136/STEM/55ef0b66757e4459b1b28064f943f7c0.png?resizew=155)
(1)平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d666dd3308604685e59f4ca22663b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20af148464904e21f4374cc8fb886fba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a074401332b35de8a53a7524ebb2007e.png)
更新时间:2023-07-21 19:30:40
|
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
【推荐1】如图,在直三棱柱
中,
是等腰直角三角形,
,
,点D是侧棱
上的一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/23/19022026-f43c-4e93-ab78-615a2dc1fa64.png?resizew=120)
(1)证明:当点D是
的中点时,
平面BCD;
(2)若二面角
的余弦值为
求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7ad3a578f403b9e6b97fa2dc955fc11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92535536bd3c2761724fd058427f95a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/23/19022026-f43c-4e93-ab78-615a2dc1fa64.png?resizew=120)
(1)证明:当点D是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6d06903252260d31d1a9cdeb735b089.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78ceb31247add8ca7b0853e801e1d125.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fac5b7d85cc224776e36a76a4db5d356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b24cbc5c871b748238867c34ffac6f70.png)
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【推荐2】如图1 ,在
中,
,D为
边上一点,以边
为对角线作平行四边形
,沿
将
折起,使得平面
平面
,如图2.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/eaa42f59-7cdc-4b5f-8ff5-936249c59869.png?resizew=317)
(1)在图 2中,设M为
的中点,求证:
;
(2)在图2中,当
最小时,求二面角
的平面角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fb407648c7d08e15e37987e3f913697.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bc1cbcd6d00f0c36bad8254297d9f33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8dc6db50a9709c3f4d84eee7bdf1250.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/eaa42f59-7cdc-4b5f-8ff5-936249c59869.png?resizew=317)
(1)在图 2中,设M为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8979376cb9469da3f642de1f110559d0.png)
(2)在图2中,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff1cdec4f1634081373699149a03554b.png)
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【推荐1】如图,在直四棱柱
中,底面ABCD是菱形,且
,E是
的中点,
.
![](https://img.xkw.com/dksih/QBM/2020/10/2/2562395576475648/2563273960767488/STEM/c67530f38b1048b193056d1122db382f.png?resizew=142)
(1)求证:面
平面EDC;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad5dfd05a1e5f1bf79a5f59e9d7f7eb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/599bfec40f2ce09a75535ac6052701a9.png)
![](https://img.xkw.com/dksih/QBM/2020/10/2/2562395576475648/2563273960767488/STEM/c67530f38b1048b193056d1122db382f.png?resizew=142)
(1)求证:面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8b71889f054eb63c395884121f37a3e.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9ea7167bf5c4414fabb8077d2eaa8b0.png)
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【推荐2】如图,四棱锥
中,四边形
是边长为2的菱形,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/a0543f9b-0a6f-4a3a-b8cf-f6f5121bcedd.png?resizew=193)
(Ⅰ)证明:平面
平面
;
(Ⅱ)若
,求四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c753cb1eb73fd8d136d00462970797.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/190761b52d7e674d952ad4c2c9d1c7a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4f5eec0addba78f2e0cdfb7ecc59a6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/a0543f9b-0a6f-4a3a-b8cf-f6f5121bcedd.png?resizew=193)
(Ⅰ)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d28c625d7ac6878957facc8274d459c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d610f2335eb148d2f670083fe070566c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c753cb1eb73fd8d136d00462970797.png)
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解题方法
【推荐1】如图所示,在底面为平行四边形的四棱锥
中,
,
平面
,且
,
,点
是
的中点.
(1)求证:
平面
;
(2)求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.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/f83a04565a8ebaa111894b724b0ba266.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca036d049f5205cf04cb1b9c5cd03f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffc3380658a60e5c139bc30572e0e98c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e2da608b66c9aee03e2503388ba4fd.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5617a404c5a3356753136e5a6b6d51e5.png)
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【推荐2】如图,四棱台ABCD﹣A1B1C1D1的底面是矩形,平面ABCD⊥平面ABB1A1,AB=2A1B1=2,AA1=2,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/ec2a790f-acd9-456e-9d61-fe7bf2ae017e.png?resizew=146)
(1)求证:DC⊥AA1;
(2)若二面角B﹣CC1﹣D的二面角的余弦值为
,求AD的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/996680dbe14b8c065efc380afb19a691.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/ec2a790f-acd9-456e-9d61-fe7bf2ae017e.png?resizew=146)
(1)求证:DC⊥AA1;
(2)若二面角B﹣CC1﹣D的二面角的余弦值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f60e55e24dd6c296d71d773af418685a.png)
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【推荐3】在四棱锥
中,四边形
是直角梯形,且
平面
,
,点
在棱
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/31/02a4d617-ee65-4fec-a415-eec1fea55790.png?resizew=176)
(1)当
时,求证:
平面
;
(2)若直线
与平面
所成的角为
,二面角
的余弦值为
,求
的值.
![](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/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e981f63409cdb1adb4428fe28ae8105d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c07f6961d2a065b432cde89f654138c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/31/02a4d617-ee65-4fec-a415-eec1fea55790.png?resizew=176)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df46cb89ec29c07e6d7b373cf845f7d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/373f735f0f04d11f1951eaef1bb78b6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9af29254fe60a392c249c5791279e9c8.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a87ad143b4be9e23cf51b63c76b45c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827ccf0c04aa941ba20d5f4c6068b46b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0519ba613bf121a2c1bc28c948266d74.png)
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