如图,在棱锥
中,侧面
是边长为2的正三角形,面
是菱形,且
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/7/2d4c6576-d195-4486-9264-148516592a52.png?resizew=179)
(1)求证:
;
(2)求证:平面
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d02bd5cfe804460846423e77f72db10f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dda09fb28b8f1e165715cca61d64f9c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27ed7540c99d80d459cce2d742694c45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30513ea48bc1ef3ae78adac83d894f14.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/7/2d4c6576-d195-4486-9264-148516592a52.png?resizew=179)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57152623d83711a2abaa5d919294adf9.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b3f399085e8595f730ec044fc467df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4da035673ef0edcfae6b72fb5e5ba34a.png)
更新时间:2019-02-14 12:50:13
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐1】如图,
为圆
的直径,点
在圆
上,且
为等腰梯形,矩形
和圆
所在的平面互相垂直,已知
.
(1)求证:平面
平面
;
(2)当
的长为何值时,平面
与平面
的夹角的大小为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29fb67185648985ee00f25b3332d7690.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/29/61f8569a-2fab-4f48-a2c0-e1ab368c4500.png?resizew=154)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/630675e0bd82419bc787b557181303d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/603c7e98deecdba0cf3773757a9b8304.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14eec658f69c267a70c1e8f9b744e282.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a09d9d486b7f91ba933210dd013a7f2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15615de1a6df206dbd081251f676578e.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图,在三棱柱
中,平面ACC1A1⊥平面ABC,∠A1AC=∠ACB= 60°,C1C= AC=2BC,D是BC的中点,H为AC上一点,且A1H⊥AC.
![](https://img.xkw.com/dksih/QBM/2022/7/18/3025338726268928/3026781523705856/STEM/ad341dfae9c04f1d87f6afbb74725f1c.png?resizew=214)
(1)证明:平面A1B1D⊥平面BB1C1C;
(2)若BC=2,求多面体A1HDB1BA的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://img.xkw.com/dksih/QBM/2022/7/18/3025338726268928/3026781523705856/STEM/ad341dfae9c04f1d87f6afbb74725f1c.png?resizew=214)
(1)证明:平面A1B1D⊥平面BB1C1C;
(2)若BC=2,求多面体A1HDB1BA的体积.
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
解题方法
【推荐1】图1是由矩形
,
和菱形
组成的一个平面图形,其中
,
,
.将其沿
折起使得
与
重合,连结
,如图2.
平面
;
(2)求图2中的四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d498a0467ff3c577a7ed175d7bffd885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0da522aef3c452767df89b8d0eb62de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de93a4fa2069aed282b7a97a4b41afbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/073f30a358cd38b809abb7cf546b1dfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/374fe9986ebbc986fc422e514ab93a51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d7090639341730951c1bc3c9b6164e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/693cd6179b2a92f03153ce12a0e86b95.png)
(2)求图2中的四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3df0d9a6c83b35a863544a01f22ef7.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,直角梯形
与等腰直角三角形
所在的平面互相垂直,
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/31/4b0b085b-1a07-4018-9bbb-451594baeed4.png?resizew=224)
(1)求证:
;
(2)求直线
与平面
所成角的正弦值;
(3)线段
上有一点
,满足
,求证:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9239cf4e895177233af8889bf3904fee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/31/4b0b085b-1a07-4018-9bbb-451594baeed4.png?resizew=224)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9874eca4abea481fa84eb772a920f9c7.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
(3)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1642eec556eb252de9c1ab7bb5ca90b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8277d279936716b723fcd7922a00cee6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356f46276f25c78bab48c1f9447a2a78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/128c69eb81dae89c6989d06d20925ad2.png)
您最近一年使用:0次