解题方法
1 . 在四棱锥
中,
为等边三角形,四边形
为矩形,
为
的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/e1bd9ede-d661-4b03-9618-561c796b196d.png?resizew=154)
证明:平面
平面
.
设二面角
的大小为
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.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/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b30987c1ff8b2cc69bb6ad6c41bde18b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/e1bd9ede-d661-4b03-9618-561c796b196d.png?resizew=154)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf9a6db3571fa57bfa2d5e4d44c51b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a438393ddfc7da1804baf4932442bb35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
您最近一年使用:0次
2020-06-15更新
|
707次组卷
|
3卷引用:山东省泰安市2020届高三6月全真模拟(三模)数学试题
解题方法
2 . 如图,在直三棱柱
中,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2020/5/27/2471928393375744/2473089068957696/STEM/6d737addf3434b8c8f137c78c43d27ae.png?resizew=170)
(1)设
,异面直线
与
所成角的余弦值为
,求
的值;
(2)若点D是
的中点,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55a2310cbba5e050488cd9296eb195d.png)
![](https://img.xkw.com/dksih/QBM/2020/5/27/2471928393375744/2473089068957696/STEM/6d737addf3434b8c8f137c78c43d27ae.png?resizew=170)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f0d53573554894dbe3b31027d7cdfe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d63588adffe924634e8ec4bb791cb64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
(2)若点D是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0ba51c39cd2a199c701a7625e6c94eb.png)
您最近一年使用:0次
解题方法
3 . 已知,如图四棱锥
中,底面
为菱形,
,
,
平面
,E,M分别是BC,PD中点,点F在棱PC上移动.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/29/8ceebc56-c670-4bc1-b363-b723c1d78c84.png?resizew=204)
(1)证明无论点F在PC上如何移动,都有平面
平面
;
(2)当直线AF与平面PCD所成的角最大时,求二面角
的余弦值.
![](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/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96127e45e2dd2494fccb1c0905951f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/29/8ceebc56-c670-4bc1-b363-b723c1d78c84.png?resizew=204)
(1)证明无论点F在PC上如何移动,都有平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6501f1c913a4ef64957a2f01ab5baa15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)当直线AF与平面PCD所成的角最大时,求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce747dfba7cd1b8054a3fc741629f257.png)
您最近一年使用:0次
2020-05-28更新
|
504次组卷
|
2卷引用:2020届湖北省八校(黄冈中学、华师一附中、襄阳四中、襄阳五中、荆州中学等)高三下学期第二次联考数学(理)试题
4 . 如图,在四棱锥
中,
,
,
,底面
为正方形,
、
分别为
、
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/0a059b16-b677-453e-913e-be5a4a7d6dfd.png?resizew=129)
(Ⅰ)证明:
平面
;
(Ⅱ)求直线
与平面
所成角的正弦值;
(Ⅲ)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9300bfac2806ffc211a19d9b7317e9d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37002ada5d194d4d062fa3285d7d9824.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15eae3c2cb4274a947f6a011960934d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/0a059b16-b677-453e-913e-be5a4a7d6dfd.png?resizew=129)
(Ⅰ)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8c2b786c64e6a9ed2ec5670cde74f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/588690c4a218025937357ffab8d63c7a.png)
(Ⅱ)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/588690c4a218025937357ffab8d63c7a.png)
(Ⅲ)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae68b15be784a6fa7a62897badf67f27.png)
您最近一年使用:0次
5 . 如图所示,在多面体
中,
平面
,
,点
在
上,点
是
的中点,且
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/25/50a0e3f7-edfa-426e-b675-cecb4095443d.png?resizew=114)
(Ⅰ)证明:
平面
;
(Ⅱ)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/689c065652544780be8b33ae92cbb6d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3dc3d90beb344a2a154a90009b51bcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b62c8b60fa6c119f2f746d66fd289374.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69e6ba36d7fff85dd69dd9e099cf1813.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/25/50a0e3f7-edfa-426e-b675-cecb4095443d.png?resizew=114)
(Ⅰ)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93cf663ee2bf1ac5c43f4306fa0cf250.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
(Ⅱ)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45992234b46d4540bc3f00a5056810cc.png)
您最近一年使用:0次
6 . 如图,菱形
中,
,
为
中点,将
沿
折起使得平面
平面
,
与
相交于点
,
是棱
上的一点且满足
.
![](https://img.xkw.com/dksih/QBM/2020/5/18/2465267479109632/2465526530899968/STEM/565544772d9b419e8ae0fb44c330324d.png?resizew=408)
(1)求证:
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.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/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d28c625d7ac6878957facc8274d459c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01ff27eea7545bb06f9472f91290c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8210bde150614e503abe6cf5945d2e34.png)
![](https://img.xkw.com/dksih/QBM/2020/5/18/2465267479109632/2465526530899968/STEM/565544772d9b419e8ae0fb44c330324d.png?resizew=408)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdc4326d832adea0655b05083e6af7f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ec2524be492bca0d1566bf848066f10.png)
您最近一年使用:0次
2020-05-18更新
|
593次组卷
|
2卷引用:陕西省西安市2020届高三下学期第三次质量检测理科数学试题
解题方法
7 . 如图,在四棱锥
中,平面
平面
,
,
,
,且
.
![](https://img.xkw.com/dksih/QBM/2020/5/12/2461213327876096/2462741089124352/STEM/73825283584940fbad326a20737b817d.png?resizew=189)
(1)过
作截面与线段
交于点H,使得
平面
,试确定点H的位置,并给出证明;
(2)在(1)的条件下,若二面角
的大小为
,试求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb96e0331eebe80ed1ff610faf531fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37591109b0a0ec5ffe2133f83310eca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95a94fb1f77d2451d00cc745252fe184.png)
![](https://img.xkw.com/dksih/QBM/2020/5/12/2461213327876096/2462741089124352/STEM/73825283584940fbad326a20737b817d.png?resizew=189)
(1)过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/011abe509df00fe9410ab08b585ad7db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68c0c35ada784e2702bcc12a405f7ec5.png)
(2)在(1)的条件下,若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9d17eca3a844f9a685e6abf162b0d22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9955b5aebb73cd84447e8541f901ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68c0c35ada784e2702bcc12a405f7ec5.png)
您最近一年使用:0次
2020-05-14更新
|
295次组卷
|
2卷引用:2020届湖南省娄底市高三高考仿真模拟理科数学试题
解题方法
8 . 如图,在四棱锥
中,
、
、
两两垂直,
,
,
,
为线段
上一点(端点除外).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/e66915ee-b77c-46ae-a203-98fd885f1050.png?resizew=103)
(1)若异面直线
、
所成角的余弦值为
,求
的长;
(2)求二面角
的平面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58097af4081e62c2ec10c006828fa544.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f121eabff3c62c1a196d9ca5f6f83f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.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/2022/12/23/e66915ee-b77c-46ae-a203-98fd885f1050.png?resizew=103)
(1)若异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1174142f3bba761585b6bc2653009b36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1069d514c3c32aeabd274475ee209ed6.png)
您最近一年使用:0次
9 . 如图所示的几何体
中,四边形
是长方形,四边形
是梯形,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fce1ddb7003591b033b1a58dc55ede7d.png)
,且
,
,平面
平面
.
![](https://img.xkw.com/dksih/QBM/2020/5/12/2461212408250368/2461630125965312/STEM/d2c715a4be0e41d1acb227ccf76a20d6.png?resizew=134)
(Ⅰ)求证:平面
平面
;
(Ⅱ)若
,二面角
为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fce1ddb7003591b033b1a58dc55ede7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11f30668670d5e32e232aa39bb2b4aac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85a2e10a5aebe40a9018d5ee3ade7af8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://img.xkw.com/dksih/QBM/2020/5/12/2461212408250368/2461630125965312/STEM/d2c715a4be0e41d1acb227ccf76a20d6.png?resizew=134)
(Ⅰ)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38e044863501be208254cbc0bd13bcda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/635d48c176fbd5b82917b7939f3afefa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0915a94b9ec678a97271b08655a38522.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbf2d033664f89ef059ac8303622a3bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f6df10d0b03d6f6e640d9c5f3695a4e.png)
您最近一年使用:0次
2020-05-13更新
|
394次组卷
|
2卷引用:2020届江西省九江市高三二模理科数学试题
名校
解题方法
10 . 如图,在几何体
中,底面
是边长为
的正方形,
平面
,
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/71364389-1ca5-4b87-908c-332d30405c78.png?resizew=193)
(Ⅰ)求证:平面
平面
;
(Ⅱ)求钝二面角
的余弦值.
![](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/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8d2d217e9bcd059908f117dfc4d4259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6768140937d815860e4e9121e570c016.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd0e59437b5fa6ce66fb2f405dea8f18.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/71364389-1ca5-4b87-908c-332d30405c78.png?resizew=193)
(Ⅰ)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9c6944008168646d5f71fe3a930b0c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
(Ⅱ)求钝二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e0a3b7d47511f83a3d6fd52f854da04.png)
您最近一年使用:0次
2020-05-12更新
|
688次组卷
|
3卷引用:2020届北京市西城区高三诊断性考试(二模)数学试题