如图,直三棱柱中,
,平面
平面
(1)证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1080295895df074480087279a84d7a2a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1080295895df074480087279a84d7a2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5f459a5b72f42693fb7e07a01357400.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
更新时间:2024-03-21 11:43:00
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图,在四棱锥
中,
,
,
,
平面
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/2020/8/26/2536414326530048/2542609594982400/STEM/38505d40228b43928cebb868018b97ef.png?resizew=208)
(Ⅰ)证明:
平面
;
(Ⅱ)求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99da52604d90b4772725a2632a39dbb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5ae8a050d7159d4296c2409e5bc0bf8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a8256dc97e0101783f83159d35eeadf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9143934f4635574d5611ffd05a650ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4c3f9dd5d0343597a7f58a1989b537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/2020/8/26/2536414326530048/2542609594982400/STEM/38505d40228b43928cebb868018b97ef.png?resizew=208)
(Ⅰ)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a5f445af1ae136773cb338920552ff2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
(Ⅱ)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5074511de93a6b92a6d74c44378ee918.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐2】已知在四棱锥
中,底面
是边长为
的正方形,
是正三角形,
,
分别是
的中点.
(1)求证:
;
(2)求平面
与平面
所成锐二面角的大小;
(3)线段
上是否存在一个动点
,使得直线
与平面
所成角为
,若存在,求线段
的长度,若不存在,说明理由.
![](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/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6e2903ff33266528a7902ad51cf8d75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d972a73469e46d582edf2061c0bd3ab4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6241f9ef86cd0a902cbadaf336767dbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dfb7dc4cac8b66c4fe51ac961379cf6.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b18c37b49bf032f58f37c0b8c75215e.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe8a84ca3a13f82aff1a022edc66065.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e9e953a4a5f98c96bbe67cbaadf76d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe8a84ca3a13f82aff1a022edc66065.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c67d01e61dc0042e67b5e8ec8e727c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/166ae856-9cf8-4b29-a32c-4c5035d330bd.png?resizew=151)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】如图所示,四棱锥
中,侧面
是边长为
的正三角形且与底面垂直,底面
是
的菱形,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/4663ace5-1124-4c04-a88c-93f1779ec762.png?resizew=220)
(1)求
与底面
所成角的大小;
(2)求证:
平面
;
(3)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/218054144a13435580cd132b9459546c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c161375e4e6f61f1cbef8083c02e975.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/4663ace5-1124-4c04-a88c-93f1779ec762.png?resizew=220)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfe67036b4671b5d2a5c55b48c4d3bb9.png)
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4643f8e7ed4155ad5b677101b477279c.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,
是边长为2的正方形,
是正方形的中心,
底面
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/2011/3/14/1570038967869440/1570038973251584/STEM/b294c0abd2de4b75b897084b897da607.png?resizew=189)
求证:(1)
平面
;
(2)直线
与平面
所成的角.
![](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/f3e126c16032892966489053f44b9048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/544172831dc1f210f3d90857dec62fec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/2011/3/14/1570038967869440/1570038973251584/STEM/b294c0abd2de4b75b897084b897da607.png?resizew=189)
求证:(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/373f735f0f04d11f1951eaef1bb78b6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
(2)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,在三棱柱
中,
,
,平面
平面
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/2/c3004192-79fb-4fb8-a4db-9ac658fc9d0c.png?resizew=158)
(1)求证:
;
(2)若
,求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92535536bd3c2761724fd058427f95a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8593e4d46679fdbab18f112db8715717.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61cdaadeae37736a1e6dd93fa1fe712f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/2/c3004192-79fb-4fb8-a4db-9ac658fc9d0c.png?resizew=158)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4b5068a142c39664e25539d27be030b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f656e1d1f68954e5f06de8958f6a9310.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f10885aaa1e46c288f82c680857e1eeb.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐2】如图①,在矩形
中,
,
为
的中点,如图②,沿
将
折起,点
在线段
上.
,求证:
平面
;
(2)若平面
平面
,是否存在点
,使得平面
与平面
的夹角为90°?若存在,求此时三棱锥
的体积;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e71cac896dc25c1b31e672599d97e2ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa5b7d5913679c6364862e09f63d8e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/502534dfabfcea51a7a69bb3046580c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bf12905647aeeded72bbca21a63f319.png)
(2)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed5f0cfc1049f84a04c81bd213afb8d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e2da608b66c9aee03e2503388ba4fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bf12905647aeeded72bbca21a63f319.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71305da8c2540788e7552e78d8df7697.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐3】如图,已知矩形
所在平面与平面
垂直,在直角梯形
中,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/33c99ddc-673e-48e7-8d41-ad78000f6a82.png?resizew=168)
(1)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/58cc6184b191e6da43911e701121517e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb55b4b96849ab53b0cb97332801b86d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb55b4b96849ab53b0cb97332801b86d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb5f33fc17da76afec7d7dfcda096e1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f6e53fed78ccd62a5a9d2f64938a96b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/153e87e7f8396a6f4e57a4e45867c4ae.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/33c99ddc-673e-48e7-8d41-ad78000f6a82.png?resizew=168)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a9ee68a3fdc62a86e53d4048e8fc04e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/335187895f612ce811414cfbedf89467.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cd6a2215f47cdb01078326d245b1523.png)
您最近一年使用:0次