名校
解题方法
1 . 如图,三棱锥
的三条棱
、
、
两两垂直,
是
的中点,
,
是
上的点,
.记二面角
,
,
的平面角分别为
,
,
,则以下结论正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/54a7011e-6f6c-44e7-b94f-b162c8615729.png?resizew=270)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bec52dd76c0802829457ae79c6e2a42f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eafe92c0386debc9bb3027bd07f8cd26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e209719e0601448698cb0c673795156.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd9ed960d92cd08e368ed56651fe6632.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f435efcc7869eec21bdba1ed81dc3f5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/54a7011e-6f6c-44e7-b94f-b162c8615729.png?resizew=270)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2020-04-25更新
|
545次组卷
|
2卷引用:浙江省湖州市菱湖中学2018-2019学年高三上学期期中数学试题
名校
2 . 如图,矩形
中心为
,现将
沿着对角线
翻折成
,记
,二面角
的平面角为
,直线
和
所成角为
,则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/4/cd5bfb67-b47b-477e-9a8d-b3c4fdc339dd.png?resizew=162)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c68101f8ffeb967bc23490e566636c54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/644f63756fe9251e65cc14e1ce9723d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a313fa9db2c50907e7341b07cdde8021.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2494168ffc550b1417f20e47c13aa81a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/001a1ffb477e4fde288a68618803b0e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f435efcc7869eec21bdba1ed81dc3f5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/4/cd5bfb67-b47b-477e-9a8d-b3c4fdc339dd.png?resizew=162)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
2019-12-03更新
|
494次组卷
|
3卷引用:浙江省湖州、衢州、丽水三地市2019-2020学年高三上学期期中数学试题
名校
解题方法
3 . 如图,在三棱柱中
,点
,
分别是
,
的中点,已知
平面
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/23/1258b9dc-c3aa-4da6-9571-a8d8805306a5.png?resizew=229)
(1)求证:
平面
;
(2)求
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/986ba572d8373df48c996f8c8611498c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5dd496ee0c1170ef6dcc48266ee444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e219a4d3927218136116040bfe5cbaa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f4da89257f9bb399d8b9cd874b222b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/23/1258b9dc-c3aa-4da6-9571-a8d8805306a5.png?resizew=229)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3cf187bc2ede965870b90757b495f53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b312dab930cbbb9a4bb1a99f044dab73.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b312dab930cbbb9a4bb1a99f044dab73.png)
您最近一年使用:0次
2020-02-16更新
|
428次组卷
|
4卷引用:2017届浙江省湖州、衢州、丽水三市高三4月联考数学试卷
名校
4 . 正方体
中,
分别是棱
的中点,点
在对角线
上,给出以下命题:
![](https://img.xkw.com/dksih/QBM/2019/6/6/2219871465463808/2235548092915712/STEM/8fddbc98-dda0-4ce6-a40e-363d484fc75c.png)
①当
在
上运动时,恒有
面
;
②若
三点共线,则
;
③若
,则
面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf4c26f3f4d96117f087400a0f32ece8.png)
④过M、N、Q三点的平面截正方体所得的截面是正六边形;
⑤若过点
且与正方体的十二条棱所成的角都相等的直线有
条;过点
且与直线
和
所成的角都为
的直线有
条,则
.
其中正确命题为_____ .(填写正确命题的编号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a5f302c1c2f7e1b46cad05594ed672e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64ec3911198b0b78f791159025f2bd54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734023d4e70010a6b2cc3267cb86e.png)
![](https://img.xkw.com/dksih/QBM/2019/6/6/2219871465463808/2235548092915712/STEM/8fddbc98-dda0-4ce6-a40e-363d484fc75c.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734023d4e70010a6b2cc3267cb86e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7592c4f01c8e06c7ee90df5b9413a9f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf4c26f3f4d96117f087400a0f32ece8.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dac152e5e7d8f9549fbc04c1d42bbfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fc45391918d0bff6b7eb6fa46a1ede3.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fc45391918d0bff6b7eb6fa46a1ede3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59da7972ac32469c793ecd7e528a6146.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf4c26f3f4d96117f087400a0f32ece8.png)
④过M、N、Q三点的平面截正方体所得的截面是正六边形;
⑤若过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cba9d180918af8c1e08ae0bc6070df9.png)
其中正确命题为
您最近一年使用:0次
2019-06-28更新
|
678次组卷
|
2卷引用:浙江省湖州市菱湖中学2018-2019学年高二上学期期中数学试题
5 . 如图所示,已知四棱锥
中,底面
为菱形,
平面
,
分别是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/d4c1886e-6511-40a0-b12a-e32e59cee15b.png?resizew=211)
(1)证明:
平面
;
(2)若
为
上的动点,
与平面
所成最大角的正切值为
,求二面角
的正切值.
![](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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c2ced225ccd8dd96914424789cd547f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/123dddb998fc1b245f9c4b173f9602cf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/d4c1886e-6511-40a0-b12a-e32e59cee15b.png?resizew=211)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4c3f9dd5d0343597a7f58a1989b537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a38a3e226347af68d7b15295342e209.png)
您最近一年使用:0次
2019-06-28更新
|
601次组卷
|
4卷引用:浙江省湖州市菱湖中学2018-2019学年高二上学期期中数学试题
浙江省湖州市菱湖中学2018-2019学年高二上学期期中数学试题浙江省温州市求知中学2018-2019学年高二下学期第二次月考数学试题山西省汾阳市2020-2021学年高二上学期期末数学(理)试题(已下线)黄金卷15-【赢在高考·黄金20卷】备战2021年高考数学(理)全真模拟卷(新课标Ⅲ卷)
6 . 如图,在四棱锥
中,底面
是边长为2的正方形,且
,平面
平面
,二面角
为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/6ae68866-fa06-40f0-9011-4d597bf6a7b4.png?resizew=127)
(Ⅰ)求证:
平面
;
(Ⅱ)求
与平面
所成角的正弦值.
![](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/490f0c21a0bfecc1447d54803af0b119.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf9a6db3571fa57bfa2d5e4d44c51b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1d76403bac26df50d934d93586f8a11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/6ae68866-fa06-40f0-9011-4d597bf6a7b4.png?resizew=127)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4c3f9dd5d0343597a7f58a1989b537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
(Ⅱ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
您最近一年使用:0次
7 . 已知三棱锥
中,
为正三角形,
,且
在底面
内的射影在
的内部(不包括边界),二面角
,二面角
,二面角
的大小分别为
,
,
,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d97778aa24ab08f82bffb1d3e7c489d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47d294d69caac577339f11f477b2047e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b796bbaeb8450404c2d146283562006e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf29d07c3751c41ab3503065a5a5052e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f435efcc7869eec21bdba1ed81dc3f5.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2019-04-18更新
|
1185次组卷
|
2卷引用:【校级联考】浙江省湖州三校2019年普通高等学校招生全国统一考试数学试题
名校
8 . 如图所示,在底面为正三角形的棱台
中,记锐二面角
的大小为
,锐二面角
的大小为
,锐二面角
的大小为
,若
,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/542292c9-df62-40e3-b051-287e4d6f7ddb.png?resizew=142)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ede6a60cad0e0b58e1549fda6e085719.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad4ba2f1a35b1d92df3bd58d09856374.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/736ae59ea5f90a62103f2840b0a17b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd872ca511462e8b69fa0c03b1b2422.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f435efcc7869eec21bdba1ed81dc3f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc593115461debf552cd5d9247e0f01e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/542292c9-df62-40e3-b051-287e4d6f7ddb.png?resizew=142)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
2019-03-13更新
|
577次组卷
|
3卷引用:浙江省湖州中学2020届高三下学期高考模拟测试(二)数学试题
浙江省湖州中学2020届高三下学期高考模拟测试(二)数学试题【校级联考】浙江省金华十校2019届高三上学期期末联考数学试题(已下线)卷02 空间向量与立体几何-单元检测(中)-2021-2022学年高二数学单元卷模拟(易中难)(2019人教A版选择性必修第一册+第二册)
9 . 如图,已知多面体
中,
,
平面
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/77d0ea08-1a33-4893-9fa9-28dc3bd458f0.png?resizew=146)
(Ⅰ)证明:
平面
;
(Ⅱ)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1e3a43d0fa18f6c0888ba804d5b329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0facf189b2a3153beb7b9e077d3b1146.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5dd496ee0c1170ef6dcc48266ee444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d5ba108d7d2d4807f2c74a22e536fe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b80ee363635d73f601654339028daec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e12bfde565540f059dd27ea47dfaa7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/77d0ea08-1a33-4893-9fa9-28dc3bd458f0.png?resizew=146)
(Ⅰ)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45fbffb9e2c7fa7c5006cde8da0cabe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(Ⅱ)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
您最近一年使用:0次
2019-02-04更新
|
793次组卷
|
4卷引用:浙江省湖州市长兴县、德清县、安吉县2019-2020学年高二上学期期中联考数学试题
10 . 如图所示,在长方体
中,
为
的中点,连接
和
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/d3dc67eb-aac3-4fe3-a150-50add7a068df.png?resizew=209)
(1)求证:平面
平面
;
(2)求二面角
的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d052b5122a42824065083ebad1d44523.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fbafedc202bd0d86c4dfdece9f8f4fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/618266e485e3ae62d21d141b02bfc960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/d3dc67eb-aac3-4fe3-a150-50add7a068df.png?resizew=209)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c940226a2a3388cb1366e5dc942900c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8257b6bd25104e07b9ad935c0a3aac4.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/698c9744e2df4cf8e1be04d0744d2a5b.png)
您最近一年使用:0次