名校
1 . 已知在正方体
中
,
分别是
的中点,
在棱
上,且
.
![](https://img.xkw.com/dksih/QBM/2018/3/1/1892871792574464/1895674445766656/STEM/0c1fcafbaaec423d90432bae95dc8ae6.png?resizew=135)
(1)求证:
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.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/89b866a756d422faec0f7eb229dfaabf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0635059fd390592d1851dfe56c72cd6.png)
![](https://img.xkw.com/dksih/QBM/2018/3/1/1892871792574464/1895674445766656/STEM/0c1fcafbaaec423d90432bae95dc8ae6.png?resizew=135)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d435974639ea2850bb5c21efe64b123b.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/766af7de7fa21b71acce31b72194cc22.png)
您最近一年使用:0次
2018-03-05更新
|
349次组卷
|
2卷引用:贵州省铜仁市第一中学2017-2018学年高二下学期开学考试数学(理)试题
名校
解题方法
2 . 如图,过底面是矩形的四棱锥F-ABCD的顶点F作
,使AB=2EF,若平面
平面
,点G在CD上且满足DG=GC.求证:
![](https://img.xkw.com/dksih/QBM/2019/5/23/2209762042617856/2209871477399552/STEM/22dc2ab21c8b46a9b660e7e1db309776.png?resizew=120)
(1)
平面
;
(2)平面
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb8df9fecaa0b266568ad35fb8f0e019.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a5628323a7eeb11213df5c9048b3543.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/2019/5/23/2209762042617856/2209871477399552/STEM/22dc2ab21c8b46a9b660e7e1db309776.png?resizew=120)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52aef9d1132740cff16178519f2e3d74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97a9b32570d553161be04d13954e92a1.png)
(2)平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/630675e0bd82419bc787b557181303d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d68ec6b93c40e26602f5de3ed9623f35.png)
您最近一年使用:0次
2017-12-26更新
|
840次组卷
|
7卷引用:贵州省凯里市第一中学2019-2020学年高二上学期开学考试数学试题
3 . 如图,在四棱锥
中,
平面
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2016/3/7/1572525264977920/1572525271113728/STEM/1ab869a8ddd74c4a9897bde71098028f.png)
(1)求证:
平面
;
(2)求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6153163fecdf3f410411048428ccaef5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e458f4503e211b542f6f30c8a34eaca5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/246fa6517e5b64b90295b9458fd7fae7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ada16b1abf359ee1c6edb056aa7f510a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ed75e65e7374c38ffb1f75259a8beb.png)
![](https://img.xkw.com/dksih/QBM/2016/3/7/1572525264977920/1572525271113728/STEM/1ab869a8ddd74c4a9897bde71098028f.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc3719c11b0b0ae54d43d6f45fe7b1f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/702e3119fa6f0a0737129da262a74834.png)
您最近一年使用:0次
4 . 已知
是异面直线,直线
平行于直线
,那么
与![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
A.一定是异面直线 | B.一定是相交直线 |
C.不可能是平行直线 | D.不可能是相交直线 |
您最近一年使用:0次
2016-12-02更新
|
937次组卷
|
17卷引用:贵州省黔南州罗甸县第一中学2022-2023学年高二上学期开学入学考数学试题
贵州省黔南州罗甸县第一中学2022-2023学年高二上学期开学入学考数学试题河北省雄安新区博奥高级中学2019-2020学年高二上学期开学考试数学试题(已下线)2011-2012学年广西桂林中学高二下学期期中数学试卷【全国校级联考】江西省南昌市八一中学、桑海中学、麻丘高中等八校2017-2018学年高二下学期期中考试数学(理)试题江西省会昌中学2018-2019学年高二上学期第一次月考数学(文)试卷(卓越班)黑龙江省大庆中学2020-2021学年高二上学期期末考试数学(文)试题人教A版2017-2018学年必修二 2.1.1平面数学试题2(已下线)专题8.3 空间点、直线、平面之间的位置关系(练)【理】-《2020年高考一轮复习讲练测》辽宁省营口市第二高级中学2018-2019学年高一下学期第一次月考数学试题(已下线)狂刷34 空间点、线、面的位置关系-学易试题君之小题狂刷2020年高考数学(理)(已下线)测试卷12 空间点、线、面之间的位置关系(A)-2021届高考数学一轮复习(文理通用)单元过关测试卷 (陕西省宝鸡市金台区2020-2021学年高一上学期期末数学试题广西玉林市育才中学2020-2021学年高一3月月考数学试题(已下线)8.4.2 空间点、直线、平面之间的位置关系(练习)-2020-2021学年下学期高一数学同步精品课堂(新教材人教版必修第二册)第二章 第一节 2.1 空间点、直线、平面之间的位置关系福建省厦门第一中学2022-2023学年高三上学期期中考试数学试题(已下线)第七章 立体几何与空间向量 第二节?空间点、直线、平面之间的位置关系(A素养养成卷)