1 . 如图,四棱锥
中, ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec6fb987b65f6afb65c3d93a10acc8f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0bad9e7c5e7371097f2972b9d3bd5b6.png)
都是边长为
的等边三角形.
![](https://img.xkw.com/dksih/QBM/2013/7/18/1571293114195968/1571293119373312/STEM/6e2f5beb-7c30-4efe-817c-4082c76702e1.png)
(I)证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61bdf608a5b79fbec4e674c8bdae3cbf.png)
(II)求点A到平面PCD的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec6fb987b65f6afb65c3d93a10acc8f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0bad9e7c5e7371097f2972b9d3bd5b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29da34089ddf01873485fae750094bc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://img.xkw.com/dksih/QBM/2013/7/18/1571293114195968/1571293119373312/STEM/6e2f5beb-7c30-4efe-817c-4082c76702e1.png)
(I)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61bdf608a5b79fbec4e674c8bdae3cbf.png)
(II)求点A到平面PCD的距离.
您最近一年使用:0次
名校
解题方法
2 . 如图甲,在矩形
中,
是
的中点,
,
,以
、
为折痕将
与
折起,使
,
重合(仍记为
),如图乙.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/187772d8-0fe2-4353-aa4e-e184ec67b669.png?resizew=358)
(1)探索:折叠形成的几何体中直线
的几何性质(写出一条即可,不含
,
,说明理由);
(2)求翻折后几何体
外接球的体积
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f144992e1cbee34868abce1e5ad38c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6830ebecddbd9759be626289c408e4f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/187772d8-0fe2-4353-aa4e-e184ec67b669.png?resizew=358)
(1)探索:折叠形成的几何体中直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3757794aa3436f7774257a8d72fabe4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6acc4078a620e18f5bdd8621d5c9952.png)
(2)求翻折后几何体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52753d89bf58589e2e83b19bd3d140b8.png)
您最近一年使用:0次
2020-07-22更新
|
739次组卷
|
5卷引用:西南名校联盟2020届“3 3 3”高考备考诊断性联考卷(三)数学(文科)试题
西南名校联盟2020届“3 3 3”高考备考诊断性联考卷(三)数学(文科)试题四川省遂宁中学校2020-2021学年高二下学期第一次月考数学(文)试题2023版 湘教版(2019) 必修第二册 过关斩将 全册综合测评(已下线)考点15 立体几何中的折叠问题 2024届高考数学考点总动员【讲】(已下线)第二章 立体几何中的计算 专题六 几何体的外接球、棱切球、内切球 微点12 二面角的四面体模型综合训练【基础版】
2020高三·全国·专题练习
解题方法
3 . 如图,边长为2的正方形
所在的平面与半圆弧
所在平面垂直,
是
上异于
,
的点.证明:平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e8a20c1fc8a5620db5db3a74eb01201.png)
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83bb3820bab977db734f4335e4fde720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83bb3820bab977db734f4335e4fde720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e8a20c1fc8a5620db5db3a74eb01201.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17c5ef850e256c98ca4f033999e61311.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/9643860e-b7eb-480e-b379-4e33e4100519.png?resizew=172)
您最近一年使用:0次
2020-12-09更新
|
747次组卷
|
6卷引用:易错点09 立体几何中的平行与垂直-备战2021年高考数学(文)一轮复习易错题
(已下线)易错点09 立体几何中的平行与垂直-备战2021年高考数学(文)一轮复习易错题(已下线)易错点09 立体几何中的平行与垂直-备战2021年高考数学(理)一轮复习易错题(已下线)练习16+直线、平面垂直的判定与性质-2020-2021学年【补习教材·寒假作业】高一数学(北师大版)(已下线)8.6空间直线、平面的垂直(1)(精炼)-2020-2021学年高一数学一隅三反系列(人教A版2019必修第二册)(已下线)专题25直线、平面的垂直与性质-2022年高三毕业班数学常考点归纳与变式演练(文理通用)(已下线)易错点12 立体几何中的平行与垂直-备战2022年高考数学考试易错题(全国通用)
4 . 如图1,在梯形
中,
,
,
,过
,
分别作
的垂线,垂足分别为
,
,已知
,
,将梯形
沿
,
同侧折起,使得平面
平面
,平面
平面
,得到图2.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/6d10f95d-c4e1-4bfa-9979-acb575ef5bd0.png?resizew=301)
(1)证明:
平面
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37591109b0a0ec5ffe2133f83310eca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eca7e1a727ba332984ad857b3d25344d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.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/82773737609e65dea3c5c67099f1b10d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86338536656046e93b53672ade9a78b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d28c625d7ac6878957facc8274d459c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/369eb8ad56da7dc1cdb7c43762be4bee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34cfba3cfc718f3684addfa740a43a05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a09d9d486b7f91ba933210dd013a7f2c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/6d10f95d-c4e1-4bfa-9979-acb575ef5bd0.png?resizew=301)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9b3b18b7f7e08f195bcdf3acfffff3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe1d31ad2890e57d54c13663b82495ef.png)
您最近一年使用:0次
2019-06-18更新
|
1131次组卷
|
5卷引用:【市级联考】西藏拉萨市2019届高三第三次模拟考试数学(文)试题
【市级联考】西藏拉萨市2019届高三第三次模拟考试数学(文)试题福建省莆田市莆田第七中学2019-2020学年高三上学期期中数学(文)试题2019届新疆维吾尔自治区高三年级第三次毕业诊断及模拟测试文科数学试题2020届四川省宜宾市叙州区第一中学校高三上学期期末考试数学(文)试题(已下线)专题8.4 直线、平面平行的判定及其性质(练)-浙江版《2020年高考一轮复习讲练测》
名校
解题方法
5 . 如图,在
中,
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fa41f80c6e33393a9f7bb57fca6b493.png)
,
是斜边
的中点,将
沿直线
翻折,若在翻折过程中存在某个位置,使得
,则
的取值范围是
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/4/72176918-fa52-4b6e-a209-d4554075167a.png?resizew=275)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/571ef38fc225d102bcd4f35bab70078c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca036d049f5205cf04cb1b9c5cd03f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fa41f80c6e33393a9f7bb57fca6b493.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab03556c333ab0b55fe86c937b2a5763.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/324aae9536a57bcaf320795715f20b75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/4/72176918-fa52-4b6e-a209-d4554075167a.png?resizew=275)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2018-10-26更新
|
1438次组卷
|
2卷引用:【省级联考】四川省高2019届高三第一次诊断性测试(理科)数学
名校
6 . 已知四边形
是矩形,
,将
沿着对角线AC翻折,得到
,设顶点
在平面
上的投影为O.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/7e9f8b3f-0bd5-4597-b4c4-d6c4ea98b03d.png?resizew=220)
(1)若点O恰好落在边AD上,①求证:
平面
;②若
,
,当BC取到最小值时,求k的值;
(2)当
时,若点O恰好落在
的内部(不包括边界),求二面角
的余弦值的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac341f7091a0995ef697fb77a905e7ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c510b85dfbca0e3ab0744655d77e8c93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/7e9f8b3f-0bd5-4597-b4c4-d6c4ea98b03d.png?resizew=220)
(1)若点O恰好落在边AD上,①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4560fa4ad459b58b723c74bd24e51ebf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f62fd0b510920be6bc60d170c3ff3da3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a5ea81e1191a8c964934a1c233e9d83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e281fa238514df41ec02e17313640d0d.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9173b446b8ff3ec5506540f277d93a15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de25bd0a6911c52d0d319c2318a67ef7.png)
您最近一年使用:0次
7 . 如图已知矩形
,
,将
沿着
翻折成一个空间四边形(A,B,C,D不共面),E,F,M,N,P分别为
,
,
,
,
的中点,设二面角
的平面角为
.下面判断错误的是( )
![](https://img.xkw.com/dksih/QBM/2020/8/26/2536414414094336/2542652901523456/STEM/08bba93194e54031a013ca339f0b285c.png?resizew=387)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f80f51c31583fea58fde645474d60b8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0005e1ef60f6ddc5f9a83e3de1ef3b2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/282d4a8c3476b2b81e3fd73898e64539.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://img.xkw.com/dksih/QBM/2020/8/26/2536414414094336/2542652901523456/STEM/08bba93194e54031a013ca339f0b285c.png?resizew=387)
A.![]() ![]() |
B.存在![]() ![]() ![]() |
C.当平面![]() ![]() ![]() |
D.当平面![]() ![]() ![]() |
您最近一年使用:0次
名校
解题方法
8 . 四边形
中,
,
,
,将四边形
沿对角线
折成直二面角
,则下列结论正确的是( )
![](https://img.xkw.com/dksih/QBM/2020/7/13/2505228609298432/2506554642923520/STEM/fe99bc6c-f8f1-4a41-aae4-2f7c57d85f63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/832afec35b94e7f73af80164b2b81c9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d6bdfb0e1be5583e794ab614a8abe1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff9c7cbcc38b28d45c8539710e5b260a.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/0fc66a96c1297e7068e987e0e70723e9.png)
![](https://img.xkw.com/dksih/QBM/2020/7/13/2505228609298432/2506554642923520/STEM/fe99bc6c-f8f1-4a41-aae4-2f7c57d85f63.png)
A.![]() | B.![]() |
C.![]() ![]() ![]() | D.四面体![]() ![]() |
您最近一年使用:0次
2020-07-15更新
|
688次组卷
|
4卷引用:江苏省苏州市常熟中学2019-2020学年高一下学期六月质量检测数学试题
江苏省苏州市常熟中学2019-2020学年高一下学期六月质量检测数学试题(已下线)考点35 空间几何体的表面积和体积(考点专练)-备战2021年新高考数学一轮复习考点微专题江苏省扬州市江都区大桥高级中学2020-2021学年高一下学期学情调研(三)数学试题江苏省镇江市扬中市第二高级中学2022-2023学年高一下学期期末检测数学试题
名校
9 . 已知平面
平面
,
,
,
,
,垂足为C,
,垂足为D(点C,D不重合),若
,则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/7/d54c90c9-9af9-4915-a96b-1ac6878b174d.png?resizew=188)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fa807136194c18d3ac58902c67f9333.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40b707f5ee4fbb2e637c65fbc6d8ed03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb0b6de90bb936cdb09629123100145d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16acea101c98a280a70c2fa0b2c04dd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c638fb895acd987140d0ca6bef097499.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb0a2d7d40a6c0bf1fddb802db381689.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59dbeb4c1bc4349c1813d78f518bdea3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/7/d54c90c9-9af9-4915-a96b-1ac6878b174d.png?resizew=188)
A.![]() ![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() ![]() |
您最近一年使用:0次
10 . 如图所示,等边三角形
的边长为2,
,
分别是
,
上的点,满足
,将
沿直线
折到
,则在翻折过程中,下列说法正确的个数是( )
①
;
②
,使得
平面
;
③若存在平面
平面
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e68a20c2d5b0b4238ea8b0564d044329.png)
![](https://img.xkw.com/dksih/QBM/2020/11/3/2584971638710272/2585617835597824/STEM/87729c63-06b3-4089-b40b-fafbc01d946b.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e210c9698063925ad2df6b6c1749571.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc7f32e4c7d1fcafc3fe0dbcf08fdd2e.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27cbdf3ac8b81542f479b8bd06df2087.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ec16c7ffbe35c622363e7f09c6a23ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e60db93cd34a54c98da9ff9782656c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7495688c046142f688c822209c0e968e.png)
③若存在平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d740c5dcc2122cb8767b512abb429f48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08052a312e4a29b6840a78850d666d92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e68a20c2d5b0b4238ea8b0564d044329.png)
![](https://img.xkw.com/dksih/QBM/2020/11/3/2584971638710272/2585617835597824/STEM/87729c63-06b3-4089-b40b-fafbc01d946b.png)
A.0 | B.1 | C.2 | D.3 |
您最近一年使用:0次