在三棱柱
中,
底面
,
为正三角形,
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/18/3303edc0-87e8-411c-9280-1fd1d56f92c7.png?resizew=175)
(1)求证:平面
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92105835f8075cb75dff244e908370b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/18/3303edc0-87e8-411c-9280-1fd1d56f92c7.png?resizew=175)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3837007567ab66f5cbe93ea39d6b259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac61c24f99a4e466f1e2ea011893866.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/453fc545c15300a8b13ee3d59353c682.png)
2021·河北邯郸·三模 查看更多[4]
河北省邯郸市2021届高三三模数学试题湖北省2021届高三下学期5月新高考模拟联考数学试题重庆市酉阳土家族苗族自治县第三中学校2021届高三数学考前猜题卷试题(已下线)考点53 章末检测八-备战2022年高考数学一轮复习考点帮(新高考地区专用)【学科网名师堂】
更新时间:2021-05-14 12:20:00
|
相似题推荐
解答题-证明题
|
适中
(0.65)
解题方法
【推荐1】如图1,在矩形ABCD中,
,E为CD的中点,现将
沿AE折起,使点D到达点P的位置,得到四棱锥
,如图2所示,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/30/75bda6eb-3060-48a3-9bc2-42032a672664.png?resizew=291)
(1)证明:平面
平面ABCE;
(2)求平面APB与平面CPE所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abc28e69c1ba0aac981256887f7dfa94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efeadd146662b5d8fe14a424138ef751.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b58bbc02479917ad761a24eaae0dbfd9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/30/75bda6eb-3060-48a3-9bc2-42032a672664.png?resizew=291)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94150b3de8f92462598101d4adc17dc3.png)
(2)求平面APB与平面CPE所成锐二面角的余弦值.
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解答题-问答题
|
适中
(0.65)
【推荐2】如图,在几何体
中,四边形
是菱形,
平面
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/28/5f5478b9-6b9c-4e75-9c04-f5e90b185c0a.png?resizew=201)
(1)证明:平面
平面
;
(2)若
,
,且二面角
是直二面角,求直线
与平面
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1e0bd4b30dc777ac9da80f6baa3eb31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a2612c3ed33135b60b5a08c173c9f84.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/28/5f5478b9-6b9c-4e75-9c04-f5e90b185c0a.png?resizew=201)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42ce82a4c37365f2d4dea2c4ad2e3288.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2443a94bed3d2b1f95c04ebd61ac134a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/179071147b940f5e2f80e74526cebf92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1496042c1d721cffd25053e997a9a97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a34e44c5d7e1d22521fb293994f5b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
名校
【推荐1】如图,在三棱锥
中,
,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/16/2070a4e2-e806-4556-a10f-3a8493d30100.png?resizew=137)
(1)当
时,求证:
平面
;
(2)当
时,求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf34f13c17a34abed0c77997cc683055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48c0d0198472d93f88fc055d238ad240.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e0595498034037b58538f8056dbc6f6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/16/2070a4e2-e806-4556-a10f-3a8493d30100.png?resizew=137)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be41b05e11ba5eadaaed9a224b949774.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96ee7262d0b5cbbade014e07e7373501.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐2】如图,在平行四边形ABCD中,AB=1,BC=2,∠ABC=60°,四边形ACEF为正方形,且平面ABCD⊥平面ACEF.
(2)求点C到平面BEF的距离;
(3)求平面BEF与平面ADF夹角的正弦值.
(2)求点C到平面BEF的距离;
(3)求平面BEF与平面ADF夹角的正弦值.
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐3】如图,四棱锥
的底面
为筝形,
于
点,
为
的五等分点,
,
,
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/6/87cd7a1a-151f-4b33-ade8-6f1b0fd4d2f0.png?resizew=183)
(1)求证:
;
(2)作出平面
与平面
所成二面角
的任意一条棱,并求该二面角
的余弦值.
![](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/5762cefdf4b2edebd125c1e0620734bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd946dad8b716592833a7bc14045a6d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/398fbc0610195cb3793a6520a160c59d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9159748d09dc452605d7bffcec904f8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e9d53c9f89997a16fd1b21493fc5b60.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/6/87cd7a1a-151f-4b33-ade8-6f1b0fd4d2f0.png?resizew=183)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bbd7c2767c106faf27d6a97ebc8e739.png)
(2)作出平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a0cbbcc3d79bf999588882e7b1b4324.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
您最近一年使用:0次