解题方法
1 . 已知矩形
中,
,
,
为线段
上一点(不在端点),沿线段
将
折成
,使得平面
平面
.
![](https://img.xkw.com/dksih/QBM/2021/6/22/2748470738575360/2782575554150400/STEM/7aa415d10a144504b48656715b5eabfe.png?resizew=338)
(1)证明:平面
与平面
不可能垂直;
(2)若二面角
大小为60°,
(ⅰ)求直线
与
所成角的余弦值;
(ⅱ)求三棱锥
的外接球的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68696b781af2609327222d22cb7bab3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58ebf8aa867ccca195ec94c3c96e9b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://img.xkw.com/dksih/QBM/2021/6/22/2748470738575360/2782575554150400/STEM/7aa415d10a144504b48656715b5eabfe.png?resizew=338)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae9bd3db15b3c5062240b4438fe6476.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e95fa1c3bcd3d0464fcadf248e90ace.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4c35e8cf7b77cda3a23aaca62cd937f.png)
(ⅰ)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9b123ae31090740589ba27a846620b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(ⅱ)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c586b72a984e1fd9082b9f02ef7f3e91.png)
您最近一年使用:0次
2 . 如图①,在正方体ABCD-A1B1C1D1中,E,F,G分别为AB,BC,BB1,的中点.
(2)将该正方体截去八个与四面体B-EFG相同的四面体得到一个多面体(如图②),若该多面体的体积是
,求该正方体的棱长.
(2)将该正方体截去八个与四面体B-EFG相同的四面体得到一个多面体(如图②),若该多面体的体积是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f23794a21242b490bce57b8e20e57e44.png)
您最近一年使用:0次
2021-08-07更新
|
471次组卷
|
3卷引用:江苏省徐州市2020-2021学年高一下学期期末数学试题
3 . 如图,在底面棱长为2侧棱长为
的正三棱柱
中,点
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/6fe944e4-d736-4887-833e-5a07c4f1c8b7.png?resizew=150)
(1)求平面
与底面
所成角的正弦值;
(2)若在四面体
内放一球,求此球的最大半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/6fe944e4-d736-4887-833e-5a07c4f1c8b7.png?resizew=150)
(1)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e51817ee1ebf17c73ed21171bcfc5b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)若在四面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41b470401f8814d3ee6f72b85bef204f.png)
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解题方法
4 . 如图,在三棱柱
中,
⊥
,AB=AC=1,D是BC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/a204ee70-5d03-4898-a4ef-d61862e5bf17.png?resizew=161)
(1)求证:
//平面
;
(2)若面
⊥面ABC,
,求几何体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/a204ee70-5d03-4898-a4ef-d61862e5bf17.png?resizew=161)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ba9e20d667d04bf3ee7f55cc795ce01.png)
(2)若面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/762d959a8fe662df26568e458c4ef394.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/778ddb5cd565f3e96697aee202b9d510.png)
您最近一年使用:0次
名校
5 . 如图,在三棱锥
中,△
为等腰直角三角形,
,
,△
为正三角形,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/2bf04990-e111-4041-bbc3-3b9c8bfa5c04.png?resizew=155)
(1)证明:平面
平面
;
(2)若棱锥
的体积为
,求平面
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb96e0331eebe80ed1ff610faf531fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/2bf04990-e111-4041-bbc3-3b9c8bfa5c04.png?resizew=155)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21e6dc2c16b657672402b9b189d1ad04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)若棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827ccf0c04aa941ba20d5f4c6068b46b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
您最近一年使用:0次
2021-08-04更新
|
645次组卷
|
3卷引用:山东省菏泽市2020-2021学年高一下学期期末数学试题
解题方法
6 . 如图,四边形
是边长为4的菱形,
,
平面
,将菱形
沿对角线
折起,使得点
到达点
的位置,且平面
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/45acf5dc-a94e-4522-88b9-813ee644fc19.png?resizew=213)
(1)求证:
平面
;
(2)若点
在同一个球面上,求三棱锥
与三棱锥
的公共部分的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/953f11eb95bfc036d85b472f81c6fb4e.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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c9156bbbb897ca199c8257fc227ebcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/45acf5dc-a94e-4522-88b9-813ee644fc19.png?resizew=213)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8c2b786c64e6a9ed2ec5670cde74f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df7fdfebdbaddc49e8991ec47d2fb076.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2254ae091ab23056b2ef83b8db517cd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddfe0ccf24d760c77535a70c92dad145.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3a264334976ed7875f109b28533ff20.png)
您最近一年使用:0次
7 . 某种“笼具”由内,外两层组成,无下底面,内层和外层分别是一个圆锥和圆柱,其中圆柱与圆锥的底面相同,圆柱有上底面,制作时接头忽略不计.已知圆柱的底面周长为
,高为
,圆锥的母线长为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/24e16fad-c3b6-4db0-ba76-e13401b16c68.png?resizew=106)
(1)求这种“笼具”的体积;
(2)现要使用一种纱网材料制作100个“笼具”,该材料的造价为每平方米4元,共需多少元?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fbcd3fa5795f3dbe4da141be709cad2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3668a3f3ce5b8a272ad92c2ebd233f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbe9f7abf7bcf4e1aa2579cd191d7761.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/24e16fad-c3b6-4db0-ba76-e13401b16c68.png?resizew=106)
(1)求这种“笼具”的体积;
(2)现要使用一种纱网材料制作100个“笼具”,该材料的造价为每平方米4元,共需多少元?
您最近一年使用:0次
解题方法
8 . 如图(1)所示,中心为
边长为
的正方形
,
、
、
、
分别为
、
、
、
上的点,
,如图(2)所示,把
和
分别沿
、
折起,使二面角
的大小为
,二面角
的大小为
.
![](https://img.xkw.com/dksih/QBM/2021/7/15/2764794796138496/2777733767168000/STEM/a6ee0c61-7d2a-4d8d-8f24-31e1728f0cc3.png?resizew=469)
(Ⅰ)判断多面体
是否为三棱柱;(只需回答结论)
(Ⅱ)证明:
平面
;
(Ⅲ)求多面体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bc0b3441658b3daf3710909ad16f441.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ded15467b6a0d3b56fd1cdf5a41a5122.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e977cb08909ddb77a8c1236bca620ac5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e31769b3bcdd90a605eeb22e9efbc6f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0745c40a9cd9035859fb15ee004d48e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/231b861d6d1f1d0b9f52b041cb40eb62.png)
![](https://img.xkw.com/dksih/QBM/2021/7/15/2764794796138496/2777733767168000/STEM/a6ee0c61-7d2a-4d8d-8f24-31e1728f0cc3.png?resizew=469)
(Ⅰ)判断多面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8219707beeae1ba4bbb328d1b7224c06.png)
(Ⅱ)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eeebdf3d00c146a1b4d220909d7573c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
(Ⅲ)求多面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb19d9e7cdaf923049655a7ba1a26c35.png)
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9 . 如图,在几何体
中,四边形
是菱形,且
,
平面
,
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/7f121158-b27e-4f45-a781-99be0eded452.png?resizew=191)
(
)证明:平面
平面
;
(
)若二面角
为
,求几何体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6906f59d09ce31956d6f5ea2b23fc77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662698361c6b3ddaf0c28a3c87be53e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27fcafd4e3c295eed2ab9c92c3d4a36b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/179071147b940f5e2f80e74526cebf92.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/7f121158-b27e-4f45-a781-99be0eded452.png?resizew=191)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8dc6db50a9709c3f4d84eee7bdf1250.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2443a94bed3d2b1f95c04ebd61ac134a.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5617a404c5a3356753136e5a6b6d51e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e5fa72f2878b476bc57f0df12d6555.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
您最近一年使用:0次
2021-08-02更新
|
487次组卷
|
2卷引用:山东省日照市2020-2021学年高一下学期期末校际联合数学试题