名校
1 . 如图,在四棱锥
中,底面
中
,
,侧面
平面
,且
,点
在棱
上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/22/29abe2ad-3248-4320-95f7-063435bc37e4.png?resizew=198)
(Ⅰ)证明:
平面
;
(Ⅱ)求二面角
的余弦值
![](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/3402ea855e2ae2dcd98f607bef4fdd6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed5f0cfc1049f84a04c81bd213afb8d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4770a1f98495ff85859bc6508d6d5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76b54647a7c34d1046c8d6c198d3654d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/22/29abe2ad-3248-4320-95f7-063435bc37e4.png?resizew=198)
(Ⅰ)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d27ff0b39832f094ec51e28721d739.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bc46688d8723cf2003fc25890265200.png)
(Ⅱ)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/135a12aa48eb33bf5116662e0f9f0799.png)
您最近一年使用:0次
2020-11-24更新
|
1029次组卷
|
4卷引用:内蒙古赤峰红旗中学2021-2022学年下学期高二年级期中考试数学试题
内蒙古赤峰红旗中学2021-2022学年下学期高二年级期中考试数学试题天一大联考(河北广东全国新高考)2020—2021 学年高中毕业班阶段性测试(二)(已下线)第八单元 立体几何 (A卷 基础过关检测)-2021年高考数学(理)一轮复习单元滚动双测卷广西南宁市2021届高三12月特训测试理科数学试题
名校
解题方法
2 . 如图,在四棱锥
中,底面
为平行四边形,
为等边三角形,平面
平面
,
.
![](https://img.xkw.com/dksih/QBM/2020/11/13/2592285581099008/2593520636993536/STEM/5544009907b045b390c3e1dda3e802ce.png?resizew=189)
(1)设
,
分别为
,
的中点,求证:
平面
;
(2)求证:
平面
;
(3)求三棱锥
的体积.
![](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/177678001b2ccde1db8f57fa5e017002.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24f08561c357bc0766b24383f1d92c26.png)
![](https://img.xkw.com/dksih/QBM/2020/11/13/2592285581099008/2593520636993536/STEM/5544009907b045b390c3e1dda3e802ce.png?resizew=189)
(1)设
![](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/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4193fb98c610f41f9a6c89d046f13d32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(3)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae1de3f5eb55a078a2dc8d2a585b86a.png)
您最近一年使用:0次
2020-11-15更新
|
624次组卷
|
3卷引用:内蒙古自治区赤峰市赤峰二中2020-2021学年高三上学期第四次月考数学(文)数学试题
名校
解题方法
3 . 如图所示,在直角梯形
中,
,
分别是
上的点,
且,
(如图1).将四边形
沿
折起,连接
,
,
(如图2).在折起的过程中,则下列表述:
①
平面
;
②四点B、C、E、F可能共面;
③
,则平面
平面
;
④平面
与平面
可能垂直.
其中正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/2cf008c7-3aba-484e-a800-d70e78e5f235.png?resizew=389)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b312dab930cbbb9a4bb1a99f044dab73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/787786e2f203f629ecfb9ec53814c1f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65436512ecbaefba4ac8123c55094211.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26ca4c94b0eca19242a0de1005dda885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5f2275cfc3cc50b92b16288db72cfe0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8197bf06d017950c85c3ba6a291c095e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
②四点B、C、E、F可能共面;
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c1be2a5bfe8bab50cb68fe52d0f92ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9367449a5847eade07e69f4feddcb027.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
④平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
其中正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/2cf008c7-3aba-484e-a800-d70e78e5f235.png?resizew=389)
A.①④ | B.①③ | C.②③④ | D.①②④ |
您最近一年使用:0次
2020-11-09更新
|
1251次组卷
|
6卷引用:内蒙古赤峰市松山区2020-2021学年高三第一次统一模拟考试理科数学试题
内蒙古赤峰市松山区2020-2021学年高三第一次统一模拟考试理科数学试题(已下线)必刷卷05-2021年高考数学(理)考前信息必刷卷(新课标卷)(已下线)必刷卷01-2021年高考数学(文)考前信息必刷卷(新课标卷)宁夏银川市2021届高三考前适应性训练(二)数学(文)试题四川省眉山市彭山区第一中学2021-2022学年高二上学期10月月考数学(文)试题(已下线)第28讲 直线与直线平行 2
解题方法
4 . 如图所示的几何体中,四边形
是正方形.四边形
是梯形
,
,平面
平面
,且
.
![](https://img.xkw.com/dksih/QBM/2020/8/18/2530428719104000/2541350020415488/STEM/946dc87c-4dbe-47e2-a00a-a30c37cee63a.png)
(1)求证:
平面
;
(2)求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c7bce6eba5d07a34f24c5370c580ac7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db13e8affea90632f591077308119cef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3025e649f4d4bc6bbda122f940cf8a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16c032261d2f887de100ed40e8fc676e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d18177e13df82a638280a154aba6e45e.png)
![](https://img.xkw.com/dksih/QBM/2020/8/18/2530428719104000/2541350020415488/STEM/946dc87c-4dbe-47e2-a00a-a30c37cee63a.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50c0f6b53de48e0f7a09419886276ccb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/218054144a13435580cd132b9459546c.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56ad3801636f311f226766d93859851e.png)
您最近一年使用:0次
2020-09-02更新
|
377次组卷
|
2卷引用:内蒙古赤峰市2019-2020学年下学期期末高二年级学年联考试卷(A)理科数学
名校
解题方法
5 . 如图,在四棱锥
中,底面四边形
满足
,
,
,且
为
的中点.
![](https://img.xkw.com/dksih/QBM/2020/7/30/2516885956493312/2519768270356480/STEM/ea2a09701f964b69a83bb2a3427b53e0.png?resizew=203)
(1)求证:
平面
;
(2)若平面
平面
,且
,求证:平面
平面
.
![](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/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae1e04eeb4de72e5750dae77bcb6f88a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e839ac941e8bf536ff35a12e56c7a400.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://img.xkw.com/dksih/QBM/2020/7/30/2516885956493312/2519768270356480/STEM/ea2a09701f964b69a83bb2a3427b53e0.png?resizew=203)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f369bec2d5682bf6b8b317a08aff546.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(2)若平面
![](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/8304e05255bc61592846a340c172ae05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7084fef1f20c7af36659c1faa643ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
您最近一年使用:0次
2020-08-03更新
|
2225次组卷
|
7卷引用:内蒙古赤峰二中2020-2021学年高二上学期第一次月考数学(文科)试题
6 . 已知六棱锥
的底面是正六边形,
平面ABC,
.则下列命题中正确的有( )
![](https://img.xkw.com/dksih/QBM/2020/6/4/2477610245136384/2481047195459584/STEM/75137fc73c114837811c97cb5b651d90.png?resizew=152)
①平面
平面PAE;
②
;
③直线CD与PF所成角的余弦值为
;
④直线PD与平面ABC所成的角为45°;
⑤
平面PAE.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3b7838a53d0b3ed4565fb6a890f365d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9801cabc43c024b9c5fac34b7db5d69b.png)
![](https://img.xkw.com/dksih/QBM/2020/6/4/2477610245136384/2481047195459584/STEM/75137fc73c114837811c97cb5b651d90.png?resizew=152)
①平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9104a1941e557a85fd1496bc2b9be297.png)
③直线CD与PF所成角的余弦值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee14db57f0c762aad845cf5b4a243c0.png)
④直线PD与平面ABC所成的角为45°;
⑤
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d3f076d3f5a78fc081c252e9a55d5c.png)
A.①④ | B.①③④ | C.②③⑤ | D.①②④⑤ |
您最近一年使用:0次
2020-06-09更新
|
687次组卷
|
8卷引用:内蒙古自治区赤峰实验中学2023-2024学年高二上学期第一次月考(10月)数学试题
内蒙古自治区赤峰实验中学2023-2024学年高二上学期第一次月考(10月)数学试题2020届广东省茂名市高三第二次综合测试数学(理)试题新疆昌吉市2019-2020学年高一下学期期末考试数学试题江西省南昌市南昌县莲塘二中2020-2021学年高二9月检测理数试题山西省太原市第五中学2020-2021学年高二上学期10月月考数学(文)试题(已下线)第32练 直线、平面垂直的判定与性质-2021年高考数学(理)一轮复习小题必刷(已下线)第01章 空间向量与立体几何(A卷基础卷)-2020-2021学年高二数学选择性必修第一册同步单元AB卷(新教材人教A版)河南省漯河市第二高级中学2022-2023学年高二上学期第一次月考数学试题
解题方法
7 . 四棱锥P﹣ABCD中,AB∥CD,AB⊥BC,AB=BC=1,PA=CD=2,PA⊥平面ABCD,E在棱PB上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/23e72e83-7552-4255-8d8c-b896597251fd.png?resizew=261)
(Ⅰ)求证:AC⊥PD;
(Ⅱ)若VP﹣ACE
,求证:PD∥平面AEC.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/23e72e83-7552-4255-8d8c-b896597251fd.png?resizew=261)
(Ⅰ)求证:AC⊥PD;
(Ⅱ)若VP﹣ACE
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8fed0174cd8f5b698ea9e04db6b3e45.png)
您最近一年使用:0次
2020-05-19更新
|
332次组卷
|
2卷引用:内蒙古自治区赤峰市红山区校级联考2024届高三上学期期中数学(文)试题
名校
8 .
分别为菱形
的边
的中点,将菱形沿对角线
折起,使点
不在平面
内,则在翻折过程中,以下命题正确的是___________ .(写出所有正确命题的序号)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/24920187-fda8-4296-a57d-2223a05f1d9d.png?resizew=319)
①
平面
;②异面直线
与
所成的角为定值;③在二面角
逐渐渐变小的过程中,三棱锥
的外接球半径先变小后变大;④若存在某个位程,使得直线
与直线
垂直,则
的取值范围是
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/481e426224c3a3ce9bb5a731eed81c40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/24920187-fda8-4296-a57d-2223a05f1d9d.png?resizew=319)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf19a7f0dd0cdf59516ae585025110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f0ac3005d5ecd6d4cea0ce99a47ef3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f00f2f6ab162f9333ec55db195d663b.png)
您最近一年使用:0次
2020-03-15更新
|
1351次组卷
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9卷引用:内蒙古赤峰二中2020-2021学年高二上学期第一次月考数学(理科)试题
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9 . 如图,在直三棱柱
中,
,
是
中点.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fd8f940b796af67206b3f9dd410a407.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0204f76cda5ea4ced714588be1efeaa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/aa11fbbc-5bab-4ee6-ab10-434c733d7f69.png?resizew=168)
(1)求证:
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db3ef97d64e58d311019b70fe5e2cc0d.png)
(2)求平面
与平面
所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/178a27068cf5517ad64f211af10256ec.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/7fd8f940b796af67206b3f9dd410a407.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0204f76cda5ea4ced714588be1efeaa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/aa11fbbc-5bab-4ee6-ab10-434c733d7f69.png?resizew=168)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/896e293411e2fd0da215ff20781cb36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db3ef97d64e58d311019b70fe5e2cc0d.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db3ef97d64e58d311019b70fe5e2cc0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
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2019-12-17更新
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46次组卷
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2卷引用:内蒙古自治区赤峰市赤峰二中2019-2020学年高二上学期11月月考数学(理)试题
名校
10 . 已知四边形
为矩形,
,
为
的中点,将
沿
折起,得到四棱锥
,设
的中点为
,在翻折过程中,得到如下有三个命题:
①
平面
,且
的长度为定值
;
②三棱锥
的最大体积为
;
③在翻折过程中,存在某个位置,使得
.
其中正确命题的序号为__________ .(写出所有正确结论的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abc28e69c1ba0aac981256887f7dfa94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e1e88b36ff71fe69c07bade0f95f1ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/519862a321d8067fb18dd2af1affb2c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f214481e6b23307a37940f6dd0313d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48856dc77af21bf856c6ea77a9077e00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
②三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db2237c2fbad38af97db3f35f7d7e83c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24c14ff9b66f21c05e52dc3c8908c2df.png)
③在翻折过程中,存在某个位置,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3b245e1ed221af9abc5c845face3a56.png)
其中正确命题的序号为
您最近一年使用:0次
2019-08-02更新
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4237次组卷
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17卷引用:内蒙古赤峰市2018-2019学年高二下学期期末联考数学(理)试题
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