解题方法
1 . 如图,多面体
中,四边形
是菱形,
,
平面
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/746294ba-bca2-496e-85e2-b689451be92a.png?resizew=178)
(1)求证:
平面
;
(2)求点
到平面
的距离.
![](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/05740f0c6071846227dc0ec177ad15e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/147e7c8ba0bbb540a712f6eb2ed6d22e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94e48efc6427ccc1c89b29ae6a19638c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d552b00c85d1e11ef3ac6b6e06221fa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/746294ba-bca2-496e-85e2-b689451be92a.png?resizew=178)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d27ff0b39832f094ec51e28721d739.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20af148464904e21f4374cc8fb886fba.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a0d238b6e9b49bbea22a79402e8e4f.png)
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解题方法
2 . 如图所示,已知三棱柱
中,若
是棱
的中点,在棱
上是否存在一点
使
平面
?并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f47d6a88e962cd790d2f159c021ec1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/063510e3c1fb6a7ccc3b8e3e3c7d660e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07b7903de4be7d5dc1175cfbf6e8da9f.png)
![](https://img.xkw.com/dksih/QBM/2016/11/18/1579005317308416/1579005317939200/STEM/f407eed13de5401bb2963db997db5530.png)
您最近一年使用:0次
2016-12-13更新
|
741次组卷
|
3卷引用:2016-2017学年山西省实验中学高二10月段测数学试卷
3 . 如图,菱形
的中心为O,四边形ODEF为矩形,平面ODEF⊥平面ABCD,DE=DA=DB=2
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/14/f21f1a63-c619-44be-9c22-e6ae8bcbbde4.png?resizew=414)
(1)若G为DC的中点,求证:EG//平面BCF;
(2)若
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/14/f21f1a63-c619-44be-9c22-e6ae8bcbbde4.png?resizew=414)
(1)若G为DC的中点,求证:EG//平面BCF;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2ee4d5eb7eef9da9703c7422227fab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cd03fcf55cebae42cad8103228a3922.png)
您最近一年使用:0次