如图为三棱锥
的平面展开图,其中
,
,垂足为
,则该三棱锥的体积为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cba09f99f17bcda7b014dedf925f070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c51c25b65a37b676ae3c3b71c29f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/26/86669901-e6fa-43fd-905b-a45edad4613c.png?resizew=152)
2023·广东·模拟预测 查看更多[3]
更新时间:2023-04-25 21:27:38
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【推荐1】如图,已知正
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【推荐2】如图,正方体
的棱长为
,
是棱
的动点,则下列说法正确的有_________ .
①
为
的中点时,直线
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935fe3125f247b7bea4f065ce9ad985.png)
②三棱锥
的体积为定值![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24396cb91a5919edf0594a0b1d6f4a00.png)
③
为
的中点时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94a39945178df29b465fc4edc78b9b34.png)
④
为
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与平面
所成的角正切值为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9868f77d5ab5073b6145f1c6d272122e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
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①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77e64cd7d049fd830287a6fb6b3a5870.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935fe3125f247b7bea4f065ce9ad985.png)
②三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0d9afa28d00f88cfa342fb72ee85c45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24396cb91a5919edf0594a0b1d6f4a00.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94a39945178df29b465fc4edc78b9b34.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b724168afaee2ecddf97257180be18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9868f77d5ab5073b6145f1c6d272122e.png)
![](https://img.xkw.com/dksih/QBM/2022/5/24/2986080986619904/2987039849865216/STEM/4f9f1213caba4d02afe6f234aeffd312.png?resizew=151)
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【推荐1】如图,在棱长为2的正方体
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
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【推荐2】已知正方体
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
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