如图,四棱锥
中,底面
为正方形,
平面
,
、
分别是棱
、
的中点.
![](https://img.xkw.com/dksih/QBM/2020/11/5/2586342451331072/2586955770290176/STEM/e7d6d43b31c5450593786ed0601d4ed8.png?resizew=265)
(1)求证:
平面
;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/2020/11/5/2586342451331072/2586955770290176/STEM/e7d6d43b31c5450593786ed0601d4ed8.png?resizew=265)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c672f693a7e75a7bae4936dcb1920430.png)
更新时间:2020-11-06 09:17:53
|
相似题推荐
解答题-证明题
|
较易
(0.85)
【推荐1】如图,正方体
的棱长为2.
(1)用空间向量方法证明:
平面
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/27/fac6497f-6b8c-4ae3-a978-b4184da37372.png?resizew=163)
(1)用空间向量方法证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f647de53756993a680347e8ce3c0f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da7977ab975efa6411cc17de39be70d9.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da7977ab975efa6411cc17de39be70d9.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
名校
解题方法
【推荐2】如图,在直三棱柱ABC—A1B1C1中,△ABC是边长为2的正三角形,AA1=2
,D是CC1的中点,E是A1B1的中点.
![](https://img.xkw.com/dksih/QBM/2020/11/6/2587377121984512/2588075600494592/STEM/a4f71e746f7f48739f2d8c7ea01c49eb.png?resizew=241)
(1)证明:DE∥平面A1BC;
(2)求点A到平面A1BC的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35361e76a7c85d1886728c8d0200b234.png)
![](https://img.xkw.com/dksih/QBM/2020/11/6/2587377121984512/2588075600494592/STEM/a4f71e746f7f48739f2d8c7ea01c49eb.png?resizew=241)
(1)证明:DE∥平面A1BC;
(2)求点A到平面A1BC的距离.
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
名校
【推荐1】如图,在四棱锥
中,底面是以O为中心的菱形,
底面ABCD,
,
,M为BC上一点.
当BM等于多少时,
平面POM?
在满足
的条件下,若
,求四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4db3940f180ba6947c2edcfaf4431e42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e14923238c05251557273d4a7f5b3f59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f93edbd735d79524f463085a4e9093bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b6311381c8cf2b4fe7983f217ad287b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f753c66e82980ba545b4ae340f45da4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49caa4ee7c22c88850ed5b2545a24fc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60e349d07c0ae25a9d8bd29b3ce9d132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f753c66e82980ba545b4ae340f45da4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a95cabb7e3645209b72508f77b66ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d5b4eefb29ffdae5db6b45b4e3e2527.png)
![](https://img.xkw.com/dksih/QBM/2018/12/14/2096702953521152/2100935793532928/STEM/f9b8ccfcde1742a6a16ea46957e0f4e6.png?resizew=320)
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
【推荐2】如图,在四棱锥
中,
平面
,
,
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/50b24b79-520a-407f-b675-04051b9b22be.png?resizew=159)
(1)求证:
平面
;
(2)求平面
与平面
夹角的余弦值;
(3)在棱
上是否存在点G(G与P,B不重合),使得
与平面
所成角的正弦值为
?若存在,求
的值,若不存在,说明理由.
![](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/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4795ee1f96b430529934e2231b38885d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8248429104b06a37cd34ab341333706b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/50b24b79-520a-407f-b675-04051b9b22be.png?resizew=159)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(3)在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6729fb0c5e5e9549035590144b73144.png)
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
【推荐3】如图,AB为圆O的直径,点C为圆上一点.满足CO⊥AB,又已知PO⊥平面ABC,垂足为O,M为PC的中点,OA=OP=2.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/baeabcf2-5cbc-4921-aab2-4fc79893f816.png?resizew=165)
(1)求证:PC⊥平面MAB;
(2)求二面角A﹣PB﹣C的余弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/baeabcf2-5cbc-4921-aab2-4fc79893f816.png?resizew=165)
(1)求证:PC⊥平面MAB;
(2)求二面角A﹣PB﹣C的余弦值.
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1】如图,
中,
,
是正方形,平面
平面
,若
、
分别是
、
的中点.
平面
;
(2)求证:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6321a96e7f0768394f6932a121adc84e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1d70676406f26d339465fe3473c0c05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5352d28609d1b3d09a0a29d023d1bb72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf60ad9db3411f35704fa88d86bfef5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
名校
【推荐2】在四棱锥
中,平面
平面
.底面
为梯形,
,
,且
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/27/575cf3da-ef5d-4d92-a265-76edda2050db.png?resizew=189)
(Ⅰ)求证:
;
(Ⅱ)求二面角
的余弦值;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da59b318eb096c1effa251d0ae6212ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed6281306726065e7075c579b9b66537.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/27/575cf3da-ef5d-4d92-a265-76edda2050db.png?resizew=189)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c583493109d50c9e4634c05e9042a9f.png)
(Ⅱ)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/715cc9ea5e7d80930284ffb117142770.png)
您最近一年使用:0次