如图所示,正三棱柱
,
,
,
分别为
,
的中点.
(1)证明:
平面
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f41d364b55d88688cd1f571ed231228.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/13/4a279866-b1fe-4150-b9f8-7012f17af1ed.png?resizew=136)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c2ac20af67f3e0891be3102d70557ba.png)
更新时间:2023-06-08 23:35:42
|
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解答题-证明题
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解题方法
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/a0af8248-4166-47ab-8537-e33909d5af55.png?resizew=159)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3e54ad0870e36726547ee79f6e093be.png)
平面
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
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(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3e54ad0870e36726547ee79f6e093be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca48c18021e7be4bbb3e95576e1c1b5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9036c32f4cf9f2ab0c79516b455bafe5.png)
您最近一年使用:0次
【推荐2】如图所示,AB为圆O的直径,
平面ABC,Q在线段PA上.
(1)求证:平面
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38b2547302fc018ecd08ba29c75ee2f3.png)
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【推荐1】如图,在四棱锥
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7592c4f01c8e06c7ee90df5b9413a9f5.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7826e3c6a53025324df827b39c9f7db7.png)
您最近一年使用:0次
解答题-问答题
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较易
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【推荐2】已知在正三棱柱
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
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![](https://img.xkw.com/dksih/QBM/2022/4/11/2955772961390592/2956403919699968/STEM/4f7738fa40d7492a83eb5a8c9a752a0e.png?resizew=180)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4193fb98c610f41f9a6c89d046f13d32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/208cbd579a843f2705612cc9ed126319.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb9766ccec6f14ff95605bea3756e69c.png)
您最近一年使用:0次