1 . 如图,在三棱锥
中,
平面
,
,
,
是
中点,
是
中点,
是线段
上一动点.
![](https://img.xkw.com/dksih/QBM/2020/5/6/2457127354843136/2458163838296064/STEM/b599612aa3124c208dae4eafcff09da7.png?resizew=239)
(1)当
为
中点时,求证:平面
平面
;
(2)当
∥平面
时,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2abbe6a4194493c55f9cd5e0c691814a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080ca48cd27d4bf9d9ef084b558fc17a.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2020/5/6/2457127354843136/2458163838296064/STEM/b599612aa3124c208dae4eafcff09da7.png?resizew=239)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3599e2d14048d66477e736223dd591d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/464978c17b30d76d7044ad8a1c8e0e59.png)
您最近一年使用:0次
2020-05-08更新
|
980次组卷
|
3卷引用:江西省七校(新余一中、丰城九中等)2020-2021学年高二(常规班)上学期第三次联考数学(理)试题
江西省七校(新余一中、丰城九中等)2020-2021学年高二(常规班)上学期第三次联考数学(理)试题2020届四川省达州市高三第二次诊断性测试数学(文科)试题(已下线)第六章 立体几何初步(能力提升)-2020-2021学年高一数学单元测试定心卷(北师大2019版必修第二册)
2 . 如图,在四棱锥
中,
平面
,
,
,
,
,
,
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/19/88b41ee0-894c-4045-aa22-87a0578cc4d1.png?resizew=134)
(1)求证:
平面
;
(2)线段
上是否存在一点
,满足
?若存在,试求出二面角
的余弦值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68d31600cba2d5256c7e78b6122d6755.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/430b77d8d2a99713b192dc729ddc2275.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ee826937d2add7a93aaa1422f8b736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ebb33adb2310a6e03918761e68204a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/559470787fd107b8781b8be7e831535d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/19/88b41ee0-894c-4045-aa22-87a0578cc4d1.png?resizew=134)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/063510e3c1fb6a7ccc3b8e3e3c7d660e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeb5255e2159617505e0c87d01437a57.png)
(2)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9637000a187c45183791bfc6ee7789.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d738d9374fb6e9284e6a58afc532cb6.png)
您最近一年使用:0次
2020-01-19更新
|
210次组卷
|
8卷引用:江西省宜春中学、高安二中、上高二中、樟树中学、丰城中学2021届高三上学期五校联考数学(理)试题
江西省宜春中学、高安二中、上高二中、樟树中学、丰城中学2021届高三上学期五校联考数学(理)试题广西壮族自治区南宁市第三中学2019-2020学年高二上学期10月月考数学(理)试题江西省宜春市上高县上高二中2019-2020学年高二上学期第三次月考数学(理)试题贵州省仁怀市第四中学2023-2024学年高二上学期第一次月考数学试题2016届湖北七市教研协作体高三4月联考试数学(理)试卷广东省六校联盟2019-2020学年高三上学期第一次联考数学(理)试题云南省玉溪市第一中学2019-2020学年高三上学期12月月考数学(理)试题(已下线)2020届高三12月第02期(考点07)(理科)-《新题速递·数学》
名校
3 . 如图,在四棱锥P﹣ABCD中,底面ABCD是菱形,且∠DAB=60°.点E是棱PC的中点,平面ABE与棱PD交于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/dd44ddce-66c7-49ad-a5f0-03a9bccbc7f5.png?resizew=199)
(1)求证:AB∥EF;
(2)若PA=PD=AD,且平面PAD⊥平面ABCD,求平面PAF与平面AFE所成的锐二面角的余弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/dd44ddce-66c7-49ad-a5f0-03a9bccbc7f5.png?resizew=199)
(1)求证:AB∥EF;
(2)若PA=PD=AD,且平面PAD⊥平面ABCD,求平面PAF与平面AFE所成的锐二面角的余弦值.
您最近一年使用:0次
2020-01-11更新
|
530次组卷
|
13卷引用:重庆綦江区2017—2018学年度第一学期期末高中联考高二理科数学试题
重庆綦江区2017—2018学年度第一学期期末高中联考高二理科数学试题重庆市綦江区2017-2018学年高二上学期期末联考数学(理)试卷2017届吉林省吉林市普通中学高三毕业班第二次调研测试数学(理)试卷【全国百强校】宁夏吴忠中学2017-2018学年高二下学期期中考试数学(理)试题湖北省黄石市2018-2019学年高二上学期期末质量监测考试数学(理)试题湖北省黄石市2018-2019学年高二上学期期末数学(理)试题重庆市江津中学2020-2021学年高二上学期第二次阶段性考试数学试题云南省陆良县2019届高三第二次模拟数学(理)试题2016届北京市朝阳区高三上学期期末联考理科数学试卷2016届江西师大附中、鹰潭一中高三下第一次联考理科数学试卷2017届江西玉山县一中高三上月考二数学(理)试卷湖南省双峰一中2017-2018学年高三上期第一次月考理科数学试题广东省中山市2018届高三上学期期末考试数学(理)试题
解题方法
4 . 已知菱形
的对角线
,
交于点
,
,
,将
沿
折起,使点
到达点
位置,满足
为等边三角形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/763aebe1-e5fc-435c-8cf2-c2627538a8de.png?resizew=198)
(1)求证:
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eee296a7d9fba487f1485c61580196f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f8f01137e92c0f2e63467036ae9cce.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d42455c69c95fb9e24a552ae4c40075e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/763aebe1-e5fc-435c-8cf2-c2627538a8de.png?resizew=198)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bbd7c2767c106faf27d6a97ebc8e739.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b796bbaeb8450404c2d146283562006e.png)
您最近一年使用:0次
5 . 已知四棱锥
中,底面
为菱形,
,平面
平面
,
,点E,F分别为
,
上的一点,且
,
.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
平面
;
(2)求
与平面
所成角的正弦值.
![](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/ea4f5eec0addba78f2e0cdfb7ecc59a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/931bbffda5e872703c9947eccc47ede2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afcbbbe350b38381d1999e2886d45f0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a91835380a5ae236e52805dcf1ae21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31ef428bd9de9bc875b343feded3c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee72fd8a5a52d08a4fddcf0830a8e103.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
您最近一年使用:0次
2019-06-06更新
|
1206次组卷
|
4卷引用:山西省山西大学附中2019-2020学年高二(12月份)第四次诊断数学(理科)试题
6 . 如图1,在高为2的梯形ABCD中,
,
,
,过A、B分别作
,
,垂足分别为E、
已知
,将D、C沿AE、BF折向同侧,得空间几何体
,如图2.
![](https://img.xkw.com/dksih/QBM/2018/12/13/2096140646875136/2098689825701888/STEM/61640313da1245f0975ba37e866a1c60.png?resizew=398)
若
,求证:
;
若
,线段AB的中点是P,求CP与平面ACD所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5408641691fd27f6dd8cf0ab2043ad4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e7fa3aea72ccc36948a4a90f7368f71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fb128c8247365e3d83d701c773b2a0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67b7f2d03aa4451755433c8123822e45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/872b75bb11d99587622ac55b9bb21bbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9be9f2c8cc327ec0032d04a3e788ff69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a91c3a5f7e979576c96c26057d7a170f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e049505e75613a3d8f773771c4ab91.png)
![](https://img.xkw.com/dksih/QBM/2018/12/13/2096140646875136/2098689825701888/STEM/61640313da1245f0975ba37e866a1c60.png?resizew=398)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38ddb320a6ab6b51ca80ddc07d4fcc0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d9a68b1c9dfb79f98996ac32d572685.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a38ed62831384856085ed64adcb6611.png)
您最近一年使用:0次
7 . 如图,四边形ABCD为正方形,
平面ABCD,E、F分别为BC和PC的中点
(1)求证:EF//平面PBD;
(2)如果AB=PD,求EF与平面ABCD所成角的正切值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77dca0e33db66ed5fcb6e5f797b99f8b.png)
(1)求证:EF//平面PBD;
(2)如果AB=PD,求EF与平面ABCD所成角的正切值
![](https://img.xkw.com/dksih/QBM/2018/5/15/1945764516085760/2005406121385984/STEM/2d96241303fe4e7e9e19d56378c19ae2.png?resizew=118)
您最近一年使用:0次
2018-08-07更新
|
582次组卷
|
3卷引用:【全国市级联考】湖南省武冈市2017-2018学年高二学考模拟数学试题
名校
8 . 如图,四棱锥
,底面
为菱形,
平面
,
,
为
的中点,
.
(1)求证:直线
平面
;
(2)求直线
与平面
所成角的正弦值.
![](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/f83a04565a8ebaa111894b724b0ba266.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05740f0c6071846227dc0ec177ad15e8.png)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4c3f9dd5d0343597a7f58a1989b537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/24/eca749c6-6586-4289-b59b-86a781dd3f7c.png?resizew=174)
您最近一年使用:0次
2018-07-16更新
|
1136次组卷
|
3卷引用:【全国校级联考】河南省豫西名校2017-2018学年高二下学期第二次联考数学(理)试题
9 . 在如图所示的多面体
中,已知
,
,
是正三角形,
,
,
是
的中点.
(1)求证:
平面
;
(2)求证:平面
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f897ab7936f8fb3c67aa0774942b8f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e20b970f3b0dc1c9a3de6eb09beead.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f8f01137e92c0f2e63467036ae9cce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62d3966314cac2e80fc1a95403310077.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19fc9f894312e55c87a0d6737080e233.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d46554105150391e671609fc6348a18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39282bdf319f30d7bc261e2e3ab3b1e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
![](https://img.xkw.com/dksih/QBM/2018/7/18/1990900339367936/1991190395781120/STEM/ad5e75fe6bb74ff78613cb78215bef1e.png?resizew=152)
您最近一年使用:0次
10 . 如图,在四棱锥
中,侧面
是边长为2的正三角形,且与底面
垂直,底面
是菱形,且
,
是棱
上的动点,且
,
.
![](https://img.xkw.com/dksih/QBM/2018/6/5/1960657623416832/1964748719398912/STEM/fb28b2cc937a4cff8d50c229b652d496.png?resizew=194)
(1)求证:
;
(2)试确定
值,使三棱锥
体积为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05740f0c6071846227dc0ec177ad15e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8322521dc117e6d2eb55e879a5545f6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2d2919e5bd26b5e9be672a3ff7604cd.png)
![](https://img.xkw.com/dksih/QBM/2018/6/5/1960657623416832/1964748719398912/STEM/fb28b2cc937a4cff8d50c229b652d496.png?resizew=194)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90da62f1614568a0b1e5e47ea85e7e3c.png)
(2)试确定
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90851c2c616aa3f67cbda65ec5789c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
您最近一年使用:0次