如图,在正方体
中,E、F分别为
、
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/233bdc2c-940e-4a8e-a9a8-da20dbcae96c.png?resizew=168)
(1)作出过点E、F、
的截面;
(2)求证:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/233bdc2c-940e-4a8e-a9a8-da20dbcae96c.png?resizew=168)
(1)作出过点E、F、
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f2bf1cd0435041fa04b01901d1c8c.png)
17-18高二上·上海普陀·阶段练习 查看更多[2]
更新时间:2020-01-09 21:30:25
|
【知识点】 证明线面平行
相似题推荐
解答题-证明题
|
容易
(0.94)
名校
解题方法
【推荐1】如图,在三棱锥P-ABC中,
底面ABC,
,D,E分别是AB,PB的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/27/a0d9fc46-625a-4080-a9ec-29fb94eaee6e.png?resizew=189)
(1)求证:
平面PAC;
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f1897a7e856b42f8cee0f286ad913d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/27/a0d9fc46-625a-4080-a9ec-29fb94eaee6e.png?resizew=189)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/063510e3c1fb6a7ccc3b8e3e3c7d660e.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e9e5f1cfea3643c30c21732073a11ef.png)
您最近一年使用:0次
解答题-问答题
|
容易
(0.94)
名校
解题方法
【推荐2】在三棱锥
中,
分别为
的中点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/11/a2d479cd-a7a8-428b-8352-26d0c225789d.png?resizew=192)
(1)证明:
平面
;
(2)若平面
平面
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d89ba4036a5d18ec4abed44d7fd8e89.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/11/a2d479cd-a7a8-428b-8352-26d0c225789d.png?resizew=192)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/002cc6a0373255f39172cdee62fb6b39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37793a3a810e823e10c340986f55ddd.png)
(2)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/342d452a7b850cd3a15b23619ad39bd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bafa8c14100a4f847b41b9148954116c.png)
您最近一年使用:0次