如图,在正四面体A-BCD中,点E,F分别是AB,BC的中点,点G,H分别在CD,AD上,且
,
.
![](https://img.xkw.com/dksih/QBM/2022/5/26/2987747352903680/2987983872802816/STEM/d39f42e6-24c4-4850-8d7a-81c8b1e7213e.png?resizew=158)
(1)求证:直线EH,FG必相交于一点,且这个交点在直线BD上;
(2)若
,求点B到平面EFGH的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5da23247bd4f8bec01f73645dfd03c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b488b36e825a6839852803ef6306d8.png)
![](https://img.xkw.com/dksih/QBM/2022/5/26/2987747352903680/2987983872802816/STEM/d39f42e6-24c4-4850-8d7a-81c8b1e7213e.png?resizew=158)
(1)求证:直线EH,FG必相交于一点,且这个交点在直线BD上;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
2022·陕西西安·模拟预测 查看更多[3]
陕西省西北工业大学附属中学2022届高三下学期第十三次适应性训练文科数学试题(已下线)第02讲 空间点、直线、平面之间的位置关系(练习)(已下线)第一章 点线面位置关系 专题三 共点问题 微点2 立体几何共点问题的解法综合训练【培优版】
更新时间:2022-05-26 23:31:39
|
相似题推荐
解答题-证明题
|
较易
(0.85)
【推荐1】如图,在四面体ABCD中,E, G分别为BC, AB的中点,点F在CD上,点H在AD上,且有DF∶FC=1∶3, DH∶HA=1∶3.求证:EF, GH, BD交于一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/447d3c6e-4913-48c8-b9ba-c949a01b992c.png?resizew=180)
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
名校
【推荐2】如图,在正四棱台
中
分别为棱
,
的中点.证明:
四点共面;
(2)多面体
是三棱台.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d46cd8de9db59ffe9e35401d5eb2a8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f29e9b2ce4da8f9ce0795ae3f01e9e6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/374fe9986ebbc986fc422e514ab93a51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42c2d86d8daea5e652d99fe1c6bc3f9a.png)
(2)多面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/125e43399d640dda4c00dc33ea0f696e.png)
您最近一年使用:0次
【推荐1】如图所示,在直三棱柱
中,
,设D为
的中点,且
.
![](https://img.xkw.com/dksih/QBM/2022/1/13/2893674106142720/2895155785875456/STEM/f50a8c09-248d-4774-b822-aa66e2cae1d2.png?resizew=218)
(1)求证:平面
平面
;
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ede6a60cad0e0b58e1549fda6e085719.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed5034a973110e2a6eb2e7d5699c24f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/429d7f7b42467fd0f8b7e759fe0428ae.png)
![](https://img.xkw.com/dksih/QBM/2022/1/13/2893674106142720/2895155785875456/STEM/f50a8c09-248d-4774-b822-aa66e2cae1d2.png?resizew=218)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/978f13ba76850101c0ecbd41f9e7c436.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87f8bf846ae0bb25d0509990b524906d.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5ed513f56811aa1d314514c5c10d90a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19735d76a0967ac4a2c9d147ba4de58e.png)
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
名校
解题方法
【推荐2】如图,在四棱锥
中,
平面
,
,
,
,
,
是
的中点,
在线段
上,且满足
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/20/ebaee7e4-9dc2-4daa-8fa5-900d949b3f3e.png?resizew=163)
(1)求证:
平面
;
(2)求点
到平面
距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee8ef58be8708144272538ee427fb92c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/beb30f1aa1c1c1fe2ca77e30e54b5fcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/559470787fd107b8781b8be7e831535d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c369cae5738730a8af7cf1ab80159498.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/20/ebaee7e4-9dc2-4daa-8fa5-900d949b3f3e.png?resizew=163)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/063510e3c1fb6a7ccc3b8e3e3c7d660e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
您最近一年使用:0次