1 . 如图,在长方体
中,
,
,则四棱锥
的体积是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57c6b0a6cb307c4c02f503831862f7d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92535536bd3c2761724fd058427f95a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65aca81ef30f0e3e00a4c2b3c53d4846.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/13/742cbdfd-ac98-4a54-b9ed-368ece95b146.png?resizew=173)
A.6 | B.9 | C.18 |
您最近一年使用:0次
2023-07-01更新
|
540次组卷
|
2卷引用:2023年重庆市普通高中学业水平合格性考试模拟(一)数学试题
解题方法
2 . 如图,在三棱锥
中,
,D、E分别是AB、AC的中点,且
平面ABC.
![](https://img.xkw.com/dksih/QBM/2020/3/12/2418141298819072/2432991658786816/STEM/3eec0a29c1374b0bb538621cd7a01891.png?resizew=284)
(1)求证:
平面PDE;
(2)求证:
平面PDE.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db807b09cc550f476b3f8fa0c6a14425.png)
![](https://img.xkw.com/dksih/QBM/2020/3/12/2418141298819072/2432991658786816/STEM/3eec0a29c1374b0bb538621cd7a01891.png?resizew=284)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/963a91995abd4927d75406d16e10a81f.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
您最近一年使用:0次
2020-04-02更新
|
720次组卷
|
3卷引用:重庆市2017年普通高中学业水平考试数学试题