1 . 如图,正方体
的棱长为
,
分别为
的中点.
(1)求证:
;
(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/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d52429789f22fe9061973e123a038d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03f5572d9521e112be8148fea4d7241f.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16155b0c208b346e93529385c8793b49.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e74534a54d7271e1b95fd3a74121468b.png)
![](https://img.xkw.com/dksih/QBM/2017/2/16/1625334186016768/1632305636458496/STEM/3ef8953362d0463789f94b1d9d73efde.png?resizew=218)
您最近一年使用:0次
2017-02-26更新
|
473次组卷
|
2卷引用:2016-2017学年广东省珠海市高一上学期期末考试B数学试卷
2 . 已知平行四边形
,
,
,
,
为
的中点,把三角形
沿
折起至
位置,使得
,
是线段
的中点.
![](https://img.xkw.com/dksih/QBM/2015/3/26/1572037567160320/1572037572517888/STEM/cdb7ec85fe5c4e65804133d4ebbc3ceb.png)
(1)求证:
;
(2)求证:面
面
;
(3)求二面角
的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0e1d24e6954a9736aa6ed412fa43bdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/657dffbd3623b705f871878fbd9df57e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/502fc5e3c7f636aac9064ec69018c95c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://img.xkw.com/dksih/QBM/2015/3/26/1572037567160320/1572037572517888/STEM/cdb7ec85fe5c4e65804133d4ebbc3ceb.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a3ab1af4b3c939b0b1f819e831e32e0.png)
(2)求证:面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83716c0f110a635037adbffc7bbbb183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/483f030abf61c6a0882d656d63cf4512.png)
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/516dfcfba39af76a6fffa94ac307f581.png)
您最近一年使用:0次