名校
解题方法
1 . 正方体
中.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/11031758-d27d-4692-acff-e5b787b7952e.png?resizew=183)
(1)已知
,
,
分别为
,
中点.
①若过
的截面与平面
平行,求此截面的面积;
②若
,
分别是
,
上动点,且
,求
长度的最小值;
(2)若正方体各个顶点都在平面
的同侧,且A,
,
,
到平面
的距离分别为1,2,3,5,试求
与平面
所成的角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/11031758-d27d-4692-acff-e5b787b7952e.png?resizew=183)
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394c5d2f55221975503be8aa18022480.png)
①若过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b7f2b545660bc026db8dbaac8b527c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
(2)若正方体各个顶点都在平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.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/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
您最近一年使用:0次
2022-07-20更新
|
566次组卷
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2卷引用:黑龙江省哈尔滨市第三中学校2021-2022学年高一下学期期末考试数学试题
名校
2 . 如图1,矩形ABCD,点E,F分别是线段AB,CD的中点,
,将矩形ABCD沿EF翻折.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/6/f4289d06-b7a3-440e-9930-5d299e03ba32.png?resizew=398)
(1)若所成二面角的大小为
(如图2),求证:直线
面DBF;
(2)若所成二面角的大小为
(如图3),点M在线段AD上,当直线BE与面EMC所成角为
时,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b58022e20e4bd2a6c25f3f3a2d14fb76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/6/f4289d06-b7a3-440e-9930-5d299e03ba32.png?resizew=398)
(1)若所成二面角的大小为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ad72d7565699d1ebb741eb0ce12bac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44b190c8d3d7d7d0e6e959e8a52eae90.png)
(2)若所成二面角的大小为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9955b5aebb73cd84447e8541f901ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/055617fcb090f104b4d163cf8fd99827.png)
您最近一年使用:0次
2022-04-14更新
|
1135次组卷
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6卷引用:黑龙江省哈尔滨市第三中学2022届高三第二次模拟考试理科数学试题
黑龙江省哈尔滨市第三中学2022届高三第二次模拟考试理科数学试题(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)三轮冲刺过关湖北省宜昌市夷陵中学2022届高三下学期5月四模数学试题(已下线)数学-2022年高考押题预测卷03(新高考卷)(已下线)新高考卷04高二理数试题-河南省豫南六校2022-2023学年高二上学期第二次联考试题
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
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2卷引用:黑龙江省齐齐哈尔市2022届高三第一次模拟考试数学(理科)试题
4 . 如图,将边长为
的等边三角形
沿与边
平行的直线
折起,使得平面
平面
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/c2c5fc03-94dd-446e-a6fc-363ebb539b70.png?resizew=156)
(1)求平面
与平面
所成角的余弦值;
(2)若
平面
,试求折痕
的长;
(3)当点
到平面
距离最大时,求折痕
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6501f1c913a4ef64957a2f01ab5baa15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b312dab930cbbb9a4bb1a99f044dab73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/c2c5fc03-94dd-446e-a6fc-363ebb539b70.png?resizew=156)
(1)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bee4a6b8ef3e79b4482388c3391d8b18.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662698361c6b3ddaf0c28a3c87be53e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ed01d1ff5a7f21a68fb3a1e5c7f393e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(3)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
您最近一年使用:0次
2021-09-30更新
|
218次组卷
|
2卷引用:黑龙江省牡丹江市第二高级中学2022-2023学年高一下学期期末数学试题
5 . 如图,
,
分别是圆台上下底面的圆心,
是下底面圆的直径,
,点
是下底面内以
为直径的圆上的一个动点(点
不在
上).
![](https://img.xkw.com/dksih/QBM/2021/5/13/2720310018605056/2720901185110016/STEM/4ef06bd6-47d9-485d-919c-6f787b33f55c.png?resizew=286)
(Ⅰ)求证:平面
平面
;
(Ⅱ)若
,
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4f6f74444b2b7947fc6e35c8d62322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34d40a9e1d9a88d1045731e8dbc16b78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6973bc602348065901b58bb1b4e6bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6973bc602348065901b58bb1b4e6bb3.png)
![](https://img.xkw.com/dksih/QBM/2021/5/13/2720310018605056/2720901185110016/STEM/4ef06bd6-47d9-485d-919c-6f787b33f55c.png?resizew=286)
(Ⅰ)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b53e60ab704a67ecabda3d3166a59a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c4ea944027f8d8edcdf305c41f36c1f.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9849ca2978032a5af95c7f9ce419b594.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16bab906d4fc26acb1a7f681a3bb2981.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaed3f5ee2d7e2831a695d0953fb9567.png)
您最近一年使用:0次
2021-05-14更新
|
924次组卷
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10卷引用:黑龙江省佳木斯市第二中学2021-2022学年高三第三次月考数学(理)试题
黑龙江省佳木斯市第二中学2021-2022学年高三第三次月考数学(理)试题山西省太原市2021届高三三模数学(理)试题江苏省南京市金陵中学2021-2022学年高三上学期学情检测考前热身数学试题(已下线)一轮复习大题专练54—立体几何(二面角3)-2022届高三数学一轮复习江苏省宿迁市泗阳县实验高级中学2021-2022学年高二下学期第一次月考数学试题上海市高桥中学2023届高三上学期9月月考数学试题四川省泸州市泸县第四中学2022-2023学年高三下学期第二次诊断性模拟考试数学(理)试题四川省成都玉林中学2023届高三下学期二诊考试理科数学模拟试题四川省泸县第四中学2023届高三第二次诊断性模拟考试数学(理科)试题四川省绵阳南山中学2023届高三下学期高考热身考试理科数学试题