名校
解题方法
1 . 如图,在四棱锥
中,底面
是矩形,
,
平面
,
为
中点.
![](https://img.xkw.com/dksih/QBM/2021/3/19/2681417230508032/2681470118010880/STEM/c9b27fb10f5741b9b469d2c7a0e7eaea.png?resizew=213)
(1)若
,求证:
平面
;
(2)当直线
与平面
所成角最大时,求三棱锥
的体积.
![](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/f80f51c31583fea58fde645474d60b8a.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/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/2021/3/19/2681417230508032/2681470118010880/STEM/c9b27fb10f5741b9b469d2c7a0e7eaea.png?resizew=213)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc532cfe64300cb3da9e04a307c957a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4c3f9dd5d0343597a7f58a1989b537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(2)当直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51f73a0ca4e6c794242489066fddb6c5.png)
您最近一年使用:0次
2021-03-19更新
|
1394次组卷
|
7卷引用:广东省梅州市梅江区嘉应中学2021届高三模拟测试(一)数学试题
2 . 已知椭圆
:
(
)的离心率为
,
的长轴是圆
:
的直径.
(1)求椭圆的标准方程;
(2)过椭圆
的左焦点
作两条相互垂直的直线
,
,其中
交椭圆
于
,
两点,
交圆
于
,
两点,求四边形
面积的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c4c098615c6bc7e6dcf72e5b5201a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d61985901c2bc698d72ac88f4e1eb65.png)
(1)求椭圆的标准方程;
(2)过椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99393efa04579f3db5cf4f7e319f0440.png)
您最近一年使用:0次
2021-03-18更新
|
1742次组卷
|
6卷引用:广东省梅江市梅州中学2022届高三上学期10月月考数学试题
广东省梅江市梅州中学2022届高三上学期10月月考数学试题广东省肇庆市2021届高三二模数学试题(已下线)专题1.8 圆锥曲线-椭圆-2021年高考数学解答题挑战满分专项训练(新高考地区专用)广东省普宁市华侨中学2023届高三上学期摸底数学试题广东省湛江市徐闻县第一中学2020-2021学年高二下学期期中数学试题广东省韶关市武江区市实验中学2021-2022学年高二下学期期中数学试题
解题方法
3 . 给定椭圆
:
(
),称圆心在原点
,半径为
圆是椭圆
的“卫星圆”.若椭圆
的一个焦点为
,点
在椭圆
上.
(1)求椭圆
的方程和其“卫星圆”方程;
(2)点
是椭圆
的“卫星圆”上的一个动点,过点
的直线
,
与椭圆
都只有一个交点,且
,
分别交其“卫星圆”于点
,
.试探究:
的长是否为定值?若为定值,写出证明过程;若不是,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c4c098615c6bc7e6dcf72e5b5201a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da001dad7941e6c9858637d7b62cec59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/030700126fb012f13935f57780b96677.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86a5952742e0f83d18cfddcda78fbcba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/084cf5ffced059f5653ee2a1023518b7.png)
您最近一年使用:0次
2020高三·全国·专题练习
名校
4 . 如图所示,椭圆
的左、右焦点分别为
、
,一条直线
经过
与椭圆交于
、
两点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/3c5ecf39-44df-4afd-9005-e636cec62921.png?resizew=180)
(1)求
的周长;
(2)若直线
的倾斜角为
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d80a47fd46072cd717442cb378d431ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/3c5ecf39-44df-4afd-9005-e636cec62921.png?resizew=180)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5e56b5cbcf69756792fc934bcc20cb.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e5fa72f2878b476bc57f0df12d6555.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5e56b5cbcf69756792fc934bcc20cb.png)
您最近一年使用:0次
2020-12-06更新
|
1607次组卷
|
13卷引用:广东省梅州市大埔县虎山中学2023届高三上学期第一次教学质量检测(8月)数学试题
广东省梅州市大埔县虎山中学2023届高三上学期第一次教学质量检测(8月)数学试题(已下线)专题52 椭圆、双曲线、抛物线(同步练习)-2021年高考一轮数学单元复习一遍过(新高考地区专用)(已下线)专题49 椭圆、双曲线、抛物线(同步练习)-2021年高考一轮数学(文)单元复习一遍过(已下线)专题52 椭圆、双曲线、抛物线(同步练习)-2021年高考一轮数学(理)单元复习一遍过(已下线)黄金卷01-【赢在高考·黄金20卷】备战2021年高考数学全真模拟卷(山东高考专用)(已下线)专题07+圆锥曲线大题专项练习-2020-2021学年【补习教材·寒假作业】高二数学(人教A版2019)(已下线)专题15+圆锥曲线大题专项练习-2020-2021学年【补习教材·寒假作业】高二数学(理)(人教A版)(已下线)专题15+圆锥曲线大题专项练习-2020-2021学年【补习教材·寒假作业】高二数学(文)(人教A版)安徽省安庆市潜山第二中学2020-2021学年高二上学期第二次月考数学(理)试题广东深圳龙岗区华中师范大学龙岗附属中学2020-2021学年高二下学期开学考试数学试题(已下线)专题15 圆锥曲线大题专项练习(已下线)专题15 圆锥曲线大题专项练习天津市第五十四中学2023-2024学年高二上学期12月月考数学试题
名校
解题方法
5 . 如图,三棱锥
的底面
和侧面
都是等边三角形,且平面
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/25/d23c529e-3024-4772-8745-6b832623fa0d.png?resizew=182)
(1)若
点是线段
的中点,求证:
平面
;
(2)点
在线段出上且满足
,求
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e5db1d2fd912f77923e4c120a7dc19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21665d21bbfb04410c78345de1fd15ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b6e6192cf24ada791c26c2d6d434069.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/25/d23c529e-3024-4772-8745-6b832623fa0d.png?resizew=182)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a6e2867f32d3f1c3cd36cd3a11a8580.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10c83f8945042b9c8fb2fbdac9308d62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bccbcfd149d3e67d528970949585ee2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cc6f6dfdbe7d39891c35f67e1a95c7f.png)
您最近一年使用:0次
2020-11-15更新
|
1763次组卷
|
6卷引用:广东省梅江市梅州中学2022届高三上学期10月月考数学试题
广东省梅江市梅州中学2022届高三上学期10月月考数学试题海南省2021届高三年级第一次模拟考试数学试题江苏省苏州市三校2021届高三下学期4月联考数学试题(已下线)大题专项训练15:立体几何(线线角、线面角)-2021届高三数学二轮复习江苏省南京师大附中2020-2021学年高二上学期12月阶段检测数学试题江苏省南通中学2020-2021学年高二上学期期末数学试题
名校
6 . 如图,在四棱锥
中,底面
为菱形,
平面
,E为
上的动点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/96486b6c-b31d-47c2-9b1f-344d00794d74.png?resizew=230)
(1)确定E的位置,使
平面
;
(2)设
,
,且在第(1)问的结论下,求二面角
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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/96486b6c-b31d-47c2-9b1f-344d00794d74.png?resizew=230)
(1)确定E的位置,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa69a2247ad4d5231aa361349b12f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e2da608b66c9aee03e2503388ba4fd.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e7b6d04f024ca05cdfacc8ce9137c15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9641d01140939c44450bf39773272af6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a03a08e6ea74ee085ed9dd4a05af94c2.png)
您最近一年使用:0次
2020-10-24更新
|
898次组卷
|
5卷引用:广东省梅州市蕉岭县蕉岭中学2021届高三上学期第三次质检数学试题
广东省梅州市蕉岭县蕉岭中学2021届高三上学期第三次质检数学试题云南省文山州2021届高三年级10月教学质量检测理科数学试题山西省大同市煤矿第四中学校2021届高三上学期期中数学(理)试题(已下线)专题30 空间中直线、平面平行位置关系的证明方法-学会解题之高三数学万能解题模板【2022版】陕西省宝鸡市渭滨区2020-2021学年高二上学期期末数学(理)试题
名校
解题方法
7 . 在平面直角坐标系
中,已知
,
,动点
满足
.
(1)求动点
的轨迹
的方程;
(2)过点
作直线
交
于
,
两点,若
的面积是
的面积的2倍,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be92f0e0012a7696c78e3e00513edefd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efb486a2e713246204f62cd6f19b5ef1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9105da5fa978f06865bc3ab109902a4c.png)
(1)求动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d776a89f4fd29dccffe1040069d59ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d79c5041878c15de69253ca11a03ab1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f25d95565e1e7f522624ed32e5a61199.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4dfec890cdfdda355e19463f3be813.png)
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2020-10-08更新
|
1612次组卷
|
11卷引用:广东省平远县平远中学2021届高三上学期第五次月考数学试题
广东省平远县平远中学2021届高三上学期第五次月考数学试题河北省张家口市邢台市衡水市2021届高三上学期摸底联考(新高考)数学试题广东省实验中学2021届高三上学期第二次阶段性测试数学试题(已下线)专题25 抛物线(解答题)-2021年高考数学(文)二轮复习热点题型精选精练(已下线)专题27 抛物线(解答题)-2021年高考数学(理)二轮复习热点题型精选精练(已下线)专题27 抛物线(解答题)-2021年高考数学二轮复习热点题型精选精练(新高考地区专用)广东省实验中学2021届高三上学期11月阶段测试数学试题普通高等学校招生全国统一考试数学预测卷(五)(已下线)专题02 圆锥曲线弦长问题-【解题思路培养】2022年高考数学一轮复习解答题拿分秘籍(全国通用版)(已下线)专题3.3抛物线(B卷提升篇)-2020-2021学年高二数学选择性必修第一册同步单元AB卷(新教材人教A版,浙江专用)陕西省西安市长安区第一中学2021-2022学年高二下学期期中文科数学试题
名校
解题方法
8 . 如图,已知圆
的直径
长为2,上半圆圆弧上有一点
,
,点
是弧
上的动点,点
是下半圆弧的中点,现以
为折线,将下半圆所在的平面折成直二面角,连接
、
、
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/fc8c1e17-23d5-43b4-a844-161e6e2408ae.png?resizew=314)
(1)当
平面
时,求
的长;
(2)当三棱锥
体积最大时,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4c0ec189655594ca472774c3ae420f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.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/editorImg/2022/11/23/fc8c1e17-23d5-43b4-a844-161e6e2408ae.png?resizew=314)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fdb2b9d6a4a54ed1328c5b3adcf7b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
(2)当三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23d352cc181bd3e1172014eadc9ab0e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7fe3b229674fb062daaca049540b9b1.png)
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2020-09-05更新
|
1090次组卷
|
10卷引用:广东省平远县平远中学2021届高三上学期第五次月考数学试题
广东省平远县平远中学2021届高三上学期第五次月考数学试题安徽省江淮十校2020-2021学年高三上学期第一次联考理科数学试题安徽省江淮十校2021届高三(8月份)第一次联考数学(理科)试题(已下线)热点09 立体几何-2021年高考数学【热点·重点·难点】专练(新高考)广东省实验中学2021届高三上学期第二次阶段性测试数学试题广东省实验中学2021届高三上学期11月阶段测试数学试题2021届青海省西宁市高三一模数学(理)试题山西省太原市山西大学附中2024届高三上学期12月月考(总第七次)数学试题山西省朔州市怀仁市2023-2024学年高三上学期第二次教学质量调研数学试题江西省南昌市第十中学2022-2023学年高二下学期第一次月考数学试题
名校
解题方法
9 . 如图,四棱锥
,四边形
为平行四边形,
,
,
,
,
,
,
为
中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/2/5bf0a396-1b09-4c92-a671-9502bbeedd11.png?resizew=210)
(1)求证:
平面
;
(2)求证:平面
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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/650c6c818df102a83ce5159e3208d01a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a23f01af749100e1888bba06268843db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27b9f4b154a308c3613409cc65486644.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9396a2523d078c7fafbdcf231a9e772d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32d0710321d97361e5782124bbf7f0c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb96e0331eebe80ed1ff610faf531fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/2/5bf0a396-1b09-4c92-a671-9502bbeedd11.png?resizew=210)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a75844725734f498eb983fe76cece2f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b33b7213d99a817bff19bcf740a0697c.png)
您最近一年使用:0次
2020-06-19更新
|
1172次组卷
|
4卷引用:广东省兴宁市第一中学2021届高三上学期期末数学试题
10 . 如图
中,
,
,
、
分别是
、
的中点,将
沿
折起连结
、
,得到多面体
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/fb92d19a-55eb-40ed-83ba-fd62541bca57.png?resizew=187)
(1)证明:在多面体
中,
;
(2)在多面体
中,当
时,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a675310c8ba418e5a59beb7317e21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b70cb8fa2705eefbfdac611e7c8cce9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4918cecca87d8cec3d9df6153122fe2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1e3a43d0fa18f6c0888ba804d5b329.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/fb92d19a-55eb-40ed-83ba-fd62541bca57.png?resizew=187)
(1)证明:在多面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1e3a43d0fa18f6c0888ba804d5b329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90197a948331e61db644266368017e3.png)
(2)在多面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1e3a43d0fa18f6c0888ba804d5b329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c85aeab3aeaf4367b711da8cde2e8bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78d07f36efcb9d203267d7c0409720cf.png)
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