已知直三棱柱
,
,
,M,N,Q分别为
,
,
的中点.
![](https://img.xkw.com/dksih/QBM/2021/1/6/2630304380739584/2633109413961728/STEM/97072e44-a402-44d4-ba7d-be8282759e2f.png?resizew=198)
(1)求证:
平面
;
(2)求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8093ef6d1cb64d41f037f4f01b69c627.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c3e9ef3e849788645552cfb0735d987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6e55b54a13f8a9f66fdf9d0ff7cf82e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaf8ddee132d4aee6be2bc73854d3f28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://img.xkw.com/dksih/QBM/2021/1/6/2630304380739584/2633109413961728/STEM/97072e44-a402-44d4-ba7d-be8282759e2f.png?resizew=198)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7592c4f01c8e06c7ee90df5b9413a9f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f96c673a2381f118ea2d3efc0bca1f3.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69f30d8bb542f69ecba950e1965b2206.png)
更新时间:2021-01-10 14:17:43
|
相似题推荐
解答题-问答题
|
较易
(0.85)
名校
解题方法
【推荐1】如图所示的几何体由等高的
个圆柱和
个圆柱拼接而成,点
为弧
的中点,且
、
、
、
四点共面.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/8c3d07da-aee3-4efe-b113-49cef78a43c4.png?resizew=151)
(1)证明:
平面
.
(2)若四边形
为正方形,且四面体
的体积为
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/8c3d07da-aee3-4efe-b113-49cef78a43c4.png?resizew=151)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f09ad78d4eccd1a9c9ccd3c4af79c79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ee01e28681b584f85c8875f053b77b.png)
(2)若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5b78d48bd70b977715edc09b1ca98a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c92d220be10b55272aab5bacd9f69721.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d599cb4a589f90b0205f24c2e1fa021e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
您最近一年使用:0次
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(0.85)
【推荐2】如图,已知一个正六棱锥的体积为12,底面边长为2,求它的侧棱长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/297abdc6-8078-48a1-af88-b0fecd17dc62.png?resizew=150)
您最近一年使用:0次
解答题-问答题
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较易
(0.85)
名校
解题方法
【推荐1】如图,在正方体
中,
为棱
上的点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/21/df6af720-0aca-46c9-a5e4-3f7817e3bc56.png?resizew=188)
(1)证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
平面
;
(2)证明:平面
平面
.
![](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/2022/6/21/df6af720-0aca-46c9-a5e4-3f7817e3bc56.png?resizew=188)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2bf9ef324f1289e205e29fed105c38e.png)
(2)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/677d1863ff4d8ac1604b18149d4f320f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2bf9ef324f1289e205e29fed105c38e.png)
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解题方法
【推荐2】如图,已知直线a,b都不在平面
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.
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