名校
解题方法
1 . 在
中,
,过点
作
,交线段
于点
(如图1),沿
将
折起,使
(如图2),点
分别为棱
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/29/af1034bc-5ab5-4b98-9116-da4bc36f5d26.png?resizew=378)
(1)求证:
;
(2)在①图1中
,②图1中
,③图2中三棱锥
的体积最大.
这三个条件中任选一个,补充在下面问题中,再解答问题.
问题:已知__________,试在棱
上确定一点
,使得
,并求平面
与平面
的夹角的余弦值.
注:如果选择多个条件分别解答,按第一个解答计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16770045e02c32c6b246f1e88c580647.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1347b1707478d309af4287a00e852b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5889e1f093f2c35273d3132ef8434e4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cca04b2a2b61d62a809776670a60c09.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/29/af1034bc-5ab5-4b98-9116-da4bc36f5d26.png?resizew=378)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73038c8fab9ef31d42b3ee0631b3dd1c.png)
(2)在①图1中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23e84ed4d1ef85e452a30c6b8f7981b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1371c97ec3d0ea7b3ef979f5538d330.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
这三个条件中任选一个,补充在下面问题中,再解答问题.
问题:已知__________,试在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5448218bd8c5b4f4a3714e0b0292d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/212a67f115d1cbe69f100b489babe5f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f5ce42fe8ea626c297e3b2a2ab95149.png)
注:如果选择多个条件分别解答,按第一个解答计分.
您最近一年使用:0次
2023-03-28更新
|
1239次组卷
|
6卷引用:宁夏银川一中2022-2023学年高二下学期期中考试数学(理)试题
宁夏银川一中2022-2023学年高二下学期期中考试数学(理)试题湖南省岳阳市2023届高三下学期二模数学试题四川省内江市2023届高三第三次模拟考试数学(理科)试题(已下线)专题07立体几何的向量方法专题16空间向量与立体几何(解答题)(已下线)专题06 立体几何 第一讲 立体几何中的证明问题(分层练)
名校
2 . 在圆锥PO中,高
,母线
,B为底面圆O上异于A的任意一点.
![](https://img.xkw.com/dksih/QBM/2022/4/14/2958094116044800/2959245912768512/STEM/910e6a9c-8820-46c4-b2b2-9fcbf48d850f.png?resizew=389)
(1)当
时,过底面圆心O作
所在平面的垂线,垂足为H,求证:
;
(2)当
时,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae890f9e8b32aa53a54158f24f4a87bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab2c27eac56fffa4cd7dbe1dcdf1a.png)
![](https://img.xkw.com/dksih/QBM/2022/4/14/2958094116044800/2959245912768512/STEM/910e6a9c-8820-46c4-b2b2-9fcbf48d850f.png?resizew=389)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3825ccc273ef9a672a606432d165b866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25490c72ad1b9968e6be5c5f6b268ab3.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d162c29b1e484cfc87350dd68f00b85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb92d6ab1b9a520e272f3649f35ab07a.png)
您最近一年使用:0次
2022-04-16更新
|
1832次组卷
|
5卷引用:宁夏回族自治区固原市西吉中学2024届高三上学期第五次模拟考试数学(理)试题
宁夏回族自治区固原市西吉中学2024届高三上学期第五次模拟考试数学(理)试题甘肃省2022届高三第二次高考诊断考试数学(理)试题(已下线)秘籍06 空间向量与立体几何(理)-备战2022年高考数学抢分秘籍(全国通用)(已下线)回归教材重难点03 空间向量与立体几何-【查漏补缺】2022年高考数学(理)三轮冲刺过关吉林省白山市抚松县第一中学2023届高考模拟预测数学试题
名校
解题方法
3 . 已知平面四边形
由等腰
和
组成,
,O为
上的点且
(如图1所示),将等腰
沿
折起,点M折至点D位置,使得平面
平面
(如图2所示).
![](https://img.xkw.com/dksih/QBM/2022/3/12/2934854783303680/2936637418496000/STEM/876eda98-db62-4b49-b468-57dfbb106600.png?resizew=258)
(1)求证:
;
(2)若点E在棱
上,且满足
,平面
和平面
所成锐二面角的余弦值为
,求四面体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0760712e3e2ea02b755b751e760d0c55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c40c49d6e2fc6fbdc21ff61841b586a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87b55c9dfab957f3011f8342cdc58d04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6647249712de84b706b773e8f752d442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c40c49d6e2fc6fbdc21ff61841b586a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de8ff58f671a287701011a1b31e67e28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://img.xkw.com/dksih/QBM/2022/3/12/2934854783303680/2936637418496000/STEM/876eda98-db62-4b49-b468-57dfbb106600.png?resizew=258)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bad3016034d5b567427c9dcf8edaea9.png)
(2)若点E在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39e7b83a2497d1662d1a95ec4cbb7495.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62871bb0dff211fc3bd80f9066c25b29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee14db57f0c762aad845cf5b4a243c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
2022-03-15更新
|
857次组卷
|
2卷引用:宁夏银川市六盘山高级中学2023届高三三模数学(理)试题
名校
4 . 如图,
两两垂直,且
,以点
为坐标原点,
所在直线分别为
轴,
轴,
轴建立空间直角坐标系
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84c83984c62d390c6b30efa5d4e560de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce80bdd73e7db62ec21a37fe6ccbb83a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84c83984c62d390c6b30efa5d4e560de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5e336d6ca2cae3d6e6c3810d7e521a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/31/40cc19cc-a503-4d26-8622-44f55ecd464e.png?resizew=138)
A.点![]() ![]() ![]() |
B.点![]() ![]() ![]() |
C.![]() ![]() |
D.平面![]() ![]() |
您最近一年使用:0次
2023-10-12更新
|
279次组卷
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2卷引用:宁夏石嘴山市平罗中学2023-2024学年高二上学期第三次月考数学试题(普通班)
名校
5 . 如图,
为正三角形,半圆
以线段
为直径,
是圆弧
上的动点(不包括
,
点)平面
平面
.
![](https://img.xkw.com/dksih/QBM/2021/5/1/2711628546719744/2715928455536640/STEM/7534e1cd-6e2f-48f1-bf22-8bddfad4c9b2.png?resizew=263)
(1)是否存在点
,使得
?若存在,求出点
的位置,若不存在,请说明理由;
(2)
,求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/a3d7090639341730951c1bc3c9b6164e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://img.xkw.com/dksih/QBM/2021/5/1/2711628546719744/2715928455536640/STEM/7534e1cd-6e2f-48f1-bf22-8bddfad4c9b2.png?resizew=263)
(1)是否存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70734a8e672376bb0bd1522e229f86a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/610eddd98cf9eaf7b69094a71e7af276.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
您最近一年使用:0次
2021-05-07更新
|
778次组卷
|
4卷引用:宁夏银川一中2021届高三下学期二模数学(理)试题
宁夏银川一中2021届高三下学期二模数学(理)试题宁夏海原县第一中学2021届高三四模数学(理)试题百强名校2021届高三5月模拟联考(A卷)理科数学试题(已下线)专题35 立体几何中的探索性问题求解策略-学会解题之高三数学万能解题模板【2022版】