已知长方体
中,
,
,
,点
是棱
上的动点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/24/762f7cd8-b226-4577-9c42-8045a61203f5.png?resizew=121)
(1)求三棱锥
的体积;
(2)当点
是棱
上的中点时,求直线
与平面
所成的角(结果用反三角函数值表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55a2310cbba5e050488cd9296eb195d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/24/762f7cd8-b226-4577-9c42-8045a61203f5.png?resizew=121)
(1)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5841ecf3472c08cda2bc85ab7a601ea.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9857d5b03bcff4181502765995885383.png)
更新时间:2020-01-13 23:01:23
|
相似题推荐
【推荐1】如图,正方体
的棱长为
,连接
,
,
,
,
,
,得到一个三棱锥.求:
![](https://img.xkw.com/dksih/QBM/2022/1/18/2897106550841344/2945815988207616/STEM/50359f532a1d4d98ab68470b3666b4b5.png?resizew=200)
(1)三棱锥
的表面积;
(2)三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebecdc0f0f815ff0083d85d3f539b36d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34503a3cda0078be5e7e04047205039e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcb94fabaf45726a6cfb11e77ca695a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/932c1e7b8e4167bda4c7b2b9123fac0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db94ea06ef27a92107d4bb70a404a826.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/316c1eaed774b3b1569a208cf4f83009.png)
![](https://img.xkw.com/dksih/QBM/2022/1/18/2897106550841344/2945815988207616/STEM/50359f532a1d4d98ab68470b3666b4b5.png?resizew=200)
(1)三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cbf69830ce094531e19ec6a1b6c267a.png)
(2)三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cbf69830ce094531e19ec6a1b6c267a.png)
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【推荐2】如图,在直三棱柱
中,
,E为
上的一点,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4a124de10dfeb196a8d2de805a8b8e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/bd549619-e775-4854-99ce-032efbf3b676.png?resizew=149)
(1)若
,求证:
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4546e633c11b94f428300aee746118e5.png)
(2)平面
将棱柱
分割为两个几何体,记上面一个几何体的体积为
,下面一个几何体的体积为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb2d97abe5af47081fe4d63f07796e9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f77483ac273b47466530e2b8d5b2c17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbfc2f6961ed3feb0313de9da59b37d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/091d2951f1dc14ab87221b0bb97e3e7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4a124de10dfeb196a8d2de805a8b8e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/bd549619-e775-4854-99ce-032efbf3b676.png?resizew=149)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62200cf899be23df36a5b63ef7351a65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8d2d217e9bcd059908f117dfc4d4259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4546e633c11b94f428300aee746118e5.png)
(2)平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a69e2d5a1f44d3f453f7d8cae0568cbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb2d97abe5af47081fe4d63f07796e9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4764374bd2fb78e59cd0b283637baeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63055a5d6916f99d07fede49120753f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f737b04ce09bc7e1ed86dc9b3c85203b.png)
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【推荐1】如图,在正方体
中,
是棱
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/3/a14eed94-322d-49cd-8797-c6a6eff28399.png?resizew=157)
(1)求直线
与平面
所成角的正弦值;
(2)确定平面
与平面
的交线;
(3)在棱
上是否存在一点
,使得![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5e884ca9429486026caa5e2310b0e4e.png)
面
?请证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/3/a14eed94-322d-49cd-8797-c6a6eff28399.png?resizew=157)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
(2)确定平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/923189afc198d153c79059a827f63c87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71a73120cd0988eb4a63436e7a4b9470.png)
(3)在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5e884ca9429486026caa5e2310b0e4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d67be899bc131ec1b9921ae9787c40d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/923189afc198d153c79059a827f63c87.png)
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解题方法
【推荐2】如图所示,在等腰三角形ABC中,BA=BC=
,
,在菱形BCDE中,
,AE=
.
![](https://img.xkw.com/dksih/QBM/2019/5/28/2213257240985600/2213568169648128/STEM/c2ef28641105495f85d3ad1955166f0b.png?resizew=158)
(1)求证:平面ABC
平面AEC;
(2)设直线CE与平面ABE所成的角为
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392b9e1a179a6676362679354a9e7e51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9593687b8b47481b6c673ae4db5a7839.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/2019/5/28/2213257240985600/2213568169648128/STEM/c2ef28641105495f85d3ad1955166f0b.png?resizew=158)
(1)求证:平面ABC
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
(2)设直线CE与平面ABE所成的角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de7d5ef3a3d9a03be91135fc426d57cc.png)
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【推荐3】如图,在正方体
中,点E在棱
上,且
,点F是棱
上的一个动点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/03906aee-5566-44ef-a090-4b18d378bc2f.png?resizew=168)
(1)点F在什么位置时,
平面
,并说明理由;
(2)若直线
与平面
所成角为
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0939ffbd2f654aff02589445b0680701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/03906aee-5566-44ef-a090-4b18d378bc2f.png?resizew=168)
(1)点F在什么位置时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1df970d8b2fcbb38bfac1dc33da9179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e2da608b66c9aee03e2503388ba4fd.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a0d238b6e9b49bbea22a79402e8e4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89c9c2c831a0552a7c934365bc49ad3f.png)
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