名校
解题方法
1 . 如图,平面四边形
中,
是等边三角形,
且
是
的中点.沿
将
翻折,折成三棱锥
,翻折过程中下列结论正确的是( )
![](https://img.xkw.com/dksih/QBM/2022/7/14/3022522264764416/3023628877758464/STEM/e0c192b5ba0b419da9dab236c17ba3c4.png?resizew=386)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8915e8e775538d41debf1933102c6b86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4ed50d0d07c007195a0263a57adbf3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3931333820859378ea6723ff3075189.png)
![](https://img.xkw.com/dksih/QBM/2022/7/14/3022522264764416/3023628877758464/STEM/e0c192b5ba0b419da9dab236c17ba3c4.png?resizew=386)
A.存在某个位置,使得![]() ![]() |
B.棱![]() ![]() ![]() ![]() |
C.三棱锥![]() ![]() ![]() |
D.当二面角![]() ![]() ![]() |
您最近一年使用:0次
2022-07-16更新
|
688次组卷
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2卷引用:黑龙江省实验中学2022-2023学年高三上学期期中考试数学试题
名校
2 . 如图,在四棱锥
中,
底面
,若
为棱
上一点,满足
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/415a90bc0c094a112d7c3e894cf53380.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54f4666b7e68689a69fe35d225efa6a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d320f180419175d75eebc618cc458b39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/415a90bc0c094a112d7c3e894cf53380.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/379ce173-1c86-45fd-a915-f1e2a74434e2.png?resizew=170)
您最近一年使用:0次
2019-01-22更新
|
876次组卷
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7卷引用:2020届黑龙江省哈尔滨师范大学附属中学高三上学期期中数学(理)试题