1 . 如图,底面
是边长为1的正方形,
平面
,
,
与平面
所成角为60°.
平面
;
(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/b8d2d217e9bcd059908f117dfc4d4259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5852b8f3ecf394b98074432eafafbf84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fdf217165748fafe938b64fa08179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f717b7d4d0978eec7330afec554c078.png)
您最近一年使用:0次
2019-05-07更新
|
1482次组卷
|
13卷引用:河北省衡水市2018届高三高考模拟联考理数试题
河北省衡水市2018届高三高考模拟联考理数试题宁夏吴忠市2022届高三一轮联考数学(理)试题2016届黑龙江省双鸭山一中高三上学期期中理科数学试卷吉林省辽源市田家炳高级中学等五校2018届高三上学期期末联数学(理)试题辽宁省抚顺中学2017-2018学年高三上学期期末考试理科数学试题广东省惠州市2021届高三上学期第一次调研数学试题广东省佛山市第四中学2021届高三上学期8月开学考试数学试题上海市大同中学2021届高三上学期开学考试数学试题2015-2016学年河北省广平县一中高二上学期第四次月考理科数学试卷2016-2017学年河北冀州中学高二理上学期月考四数学试卷【全国百强校】贵州省铜仁市第一中学2018-2019学年高二下学期期中考试数学(理)试题内蒙古赤峰二中2020-2021学年高二上学期第一次月考数学(理科)试题广东省佛山市南海区狮山石门高级中学2020-2021学年高二上学期第二次统考数学试题
2 . 在矩形
中,
,
,
为线段
的中点,如图1,沿
将
折起至
,使
,如图2所示.
![](https://img.xkw.com/dksih/QBM/2018/4/19/1927671923531776/1930450518261760/STEM/7ad67f55ae984cf3a1fd9d7f3463187d.png?resizew=396)
(1)求证:平面
平面
;
(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/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3814287dbb60d478bffc5366f9928b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1742b04f56cd6b3c956b4607ebb880f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b8a2de1d86ce80be87e8d10d1c90da8.png)
![](https://img.xkw.com/dksih/QBM/2018/4/19/1927671923531776/1930450518261760/STEM/7ad67f55ae984cf3a1fd9d7f3463187d.png?resizew=396)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a26a7784c7419d8359fb119c8ecc03d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11f8759991daa986ef2e729fb6170ccf.png)
您最近一年使用:0次
2018-04-23更新
|
804次组卷
|
2卷引用:山东K12联盟2018届高三开年迎春考试数学(理)试题
2010·浙江·一模
名校
解题方法
3 . 如图,在
中,已知
,
,
,
为线段
的中点,
是由
绕直线
旋转而成,记二面角
的大小为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/8b5a2544-e530-4ecd-9054-07a81945819b.png?resizew=146)
(1)当平面
平面
时,求
的值;
(2)当
时,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac51bffb8f476896081027b33f7ec25d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21d2dce5b56202928f18d92cff6f3a5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.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/2bbf9680f74a9ac5d934304654ce2771.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a19c1bcb8431ae315ecd29c6478d3eff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/8b5a2544-e530-4ecd-9054-07a81945819b.png?resizew=146)
(1)当平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95a55c40bb7437081d8e669974c8d1b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a77343ecde1c2665df291761b6563.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0817e4c901a4729662505086e7ec6c69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db96e654d4fed42a850d0d82bda6507f.png)
您最近一年使用:0次
2020-03-19更新
|
354次组卷
|
6卷引用:2011届浙江省高三高考样卷数学理卷
(已下线)2011届浙江省高三高考样卷数学理卷2018届浙江省杭州二中高三下学期5月统测模拟数学试题2019届浙江省宁波市镇海中学高三下学期高考适应性考试数学试题江西省八校2022届高三第一次联考数学(理)试题(已下线)2011届江西省重点中学联盟学校高三第一次联考数学理卷(已下线)2012届浙江省重点中学协作体高三3月调研理科数学试卷
4 . 如图,棱长为
的正方体的顶点
在平面
内,三条棱
,
,
都在平面
的同侧. 若顶点
,
到平面
的距离分别为
,
,则平面
与平面
所成锐二面角的余弦值为________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](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/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://img.xkw.com/dksih/QBM/2017/9/4/1766885189820416/1768189697097728/STEM/f010708993524f86b20b3fde0d7be584.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2017/9/4/1766885189820416/1768189697097728/STEM/30ec87ec-8bfa-42af-9096-20f02a40f4c5.png?resizew=192)
您最近一年使用:0次
2017-09-06更新
|
3035次组卷
|
3卷引用:浙江省名校协作体2018届高三上学期联考数学试题
浙江省名校协作体2018届高三上学期联考数学试题山东省日照市校际联合考试2021-2022学年高三上学期期末数学试题(已下线)第一章 空间向量与立体几何(单元重点综合测试)-2023-2024学年高二数学单元速记·巧练(人教A版2019选择性必修第一册)
名校
5 . 如图
和
均为等腰直角三角形,
,
,平面
平面
,
平面
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9c3ec174b1ce835cc8737ff6ce57e52.png)
![](https://img.xkw.com/dksih/QBM/2017/5/21/1691948064817152/1692613673435136/STEM/16ba5a740fde4daa8115b3ce09834a90.png?resizew=150)
(1)证明:
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5e1441a49e782ff0ef46e776cde06a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/650c6c818df102a83ce5159e3208d01a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d7090639341730951c1bc3c9b6164e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f09ad78d4eccd1a9c9ccd3c4af79c79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/065f2c3527fcc9d84939c47ac8640643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9c3ec174b1ce835cc8737ff6ce57e52.png)
![](https://img.xkw.com/dksih/QBM/2017/5/21/1691948064817152/1692613673435136/STEM/16ba5a740fde4daa8115b3ce09834a90.png?resizew=150)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a879800a059ce741a99bb2c171f32afe.png)
您最近一年使用:0次
2017-05-22更新
|
1898次组卷
|
2卷引用:山东省烟台市2017届高三适应性练习(二)数学(理)试题
名校
6 . 如图,四棱锥中
,
,
与
都是边长为2的等边三角形,
是
的中点.
(Ⅰ)求证:
平面
;
(Ⅱ)求平面
与平面
所成二面角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afc425b071356d9d3d591b3a09358911.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ee81b6066188abee9d167b6c7f3f71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53502463cc76201000e02df314e58769.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6e2903ff33266528a7902ad51cf8d75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31c34b18525831f3eda7bb90be0199b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(Ⅱ)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://img.xkw.com/dksih/QBM/2017/3/10/1641017003319296/1641067728494592/STEM/45f25ec75504418a9e13a9b28e081a5f.png?resizew=228)
您最近一年使用:0次
2017-03-10更新
|
932次组卷
|
3卷引用:2017届山东省淄博市高三3月模拟考试数学理试卷
7 . 如图,在四棱锥
中,平面
平面
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
,在锐角
中
,并且
,
.
![](https://img.xkw.com/dksih/QBM/2015/5/27/1572114821300224/1572114826805248/STEM/0dfef42deca94a0296336667d9ecc7d9.png?resizew=169)
(1)点
是
上的一点,证明:平面
平面
;
(2)若
与平面
所成角为
,当面
平面
时,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a675310c8ba418e5a59beb7317e21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62974d34de3a12418d6b700420afd1b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58579094b5d753e9205c2ec89ca3ae07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5e8d9bd81b063a824baf17d947db5ee.png)
![](https://img.xkw.com/dksih/QBM/2015/5/27/1572114821300224/1572114826805248/STEM/0dfef42deca94a0296336667d9ecc7d9.png?resizew=169)
(1)点
![](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/a6fb16d2f0db758b8b7a8d3743143f48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6fb16d2f0db758b8b7a8d3743143f48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
2014·广东湛江·一模
名校
解题方法
8 . 在如图所示的几何体中,四边形
为平行四边形,
,
平面
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2014/4/28/1571681095139328/1571681100988416/STEM/d2fd3c26c0c84c68ab2b1ec536cbb2ac.png?resizew=217)
(1)若
是线段
的中点,求证:
平面
;
(2)若
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ed8f7d3d7043d4b1eb98fc5c4e2fcd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed04b01505bbd8a4ac0bc12e46f23bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e41d3f7d55fcbaebc4e2450ac63a3dc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9c30de91ed42df92510cb64548fe704.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c05f315ab14567942f699983b60d04be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed6034301fc4110da89bdb0f46ad82ab.png)
![](https://img.xkw.com/dksih/QBM/2014/4/28/1571681095139328/1571681100988416/STEM/d2fd3c26c0c84c68ab2b1ec536cbb2ac.png?resizew=217)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6895bdd0286b8e2704fee9c343d82f57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/369eb8ad56da7dc1cdb7c43762be4bee.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a9cd88984f891a49ab451a06410a1f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4b820c84570da9c38d0a81c22788b76.png)
您最近一年使用:0次
2016-12-02更新
|
1477次组卷
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3卷引用:2014届广东省湛江市高三高考模拟测试二理科数学试卷
(已下线)2014届广东省湛江市高三高考模拟测试二理科数学试卷宁夏银川唐徕回民中学2019-2020学年高二12月数学(理)试题甘肃省金昌市永昌县第一高级中学2020-2021学年高二上学期期末数学(理)试题
9 . 如图,四棱锥
的底面ABCD是平行四边形,
,
,
面
,设
为
中点,点
在线段
上且
.
(1)求证:
平面
;
(2)设二面角
的大小为
,若
,求
的长.
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/fbe2c93024cc4defbfd664d248c9f26b.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/dfbc51addab444a3a829a72863be52cd.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/882d788e0d574781b1594dc4601e5ec3.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/685c0c13d9b543ccb2abf857ba21f484.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/0f88a790965642b7bbd40dda123949cc.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/066cf30d2e9a4832ae21171d00faf2b5.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/31ca9d8f8e9b4da186f066541aa59eaf.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/29fd2392bfdb43eea30beb3d43441b56.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/17d0bfeb73964d6285dd9ccc81789d94.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/b3582d2246694bb6857ebdf05e0531a2.png)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/c61280d2722c4813b479568feb9fe407.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/d311c1e3123d4b8a80686aaf2c8c2b16.png)
(2)设二面角
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/8d05f983837848fa9266c355b68a62ec.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/deb1ec2b0dc944f5b9c7c266918e6e19.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/b391963284c348f493386694ee942773.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/47c7fdd31de043c5a115e358424e563a.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/d69f2e43a8ea4c0b901632955bcc2ed9.png)
您最近一年使用:0次
真题
解题方法
10 . 如图所示,在三棱锥
中,
平面
,
,
分别是
的中点,
,
与
交于
,
与
交于点
,连接
.
![](https://img.xkw.com/dksih/QBM/2013/7/18/1571294719934464/1571294725439488/STEM/6dd45b3e5ac447f3a7c3196078628f3f.png?resizew=327)
(Ⅰ)求证:
;
(Ⅱ)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c499b1f470978c4f8cc05ffdebc2e961.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45fbffb9e2c7fa7c5006cde8da0cabe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64484f96568410926e0c50898eba6e32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34c83e50750b60551033b5a177167117.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb7da34d259c8c55cc033c4c833ec61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e9a32fd1185bc9c1594123e0ff34da6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e40454aa04533144f862c09680099018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15febfda66e733f14aa7115ed4343a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632917e61f4208959686d118c7f19231.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://img.xkw.com/dksih/QBM/2013/7/18/1571294719934464/1571294725439488/STEM/6dd45b3e5ac447f3a7c3196078628f3f.png?resizew=327)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b75a1c6817507e7b15a2e4903e317a6.png)
(Ⅱ)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e20703ca7984a80e59d711b8283ee8aa.png)
您最近一年使用:0次
2016-12-02更新
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3013次组卷
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7卷引用:2020年全国普通高等学校统一招生考试试验检测卷2数学(文科)试题
2020年全国普通高等学校统一招生考试试验检测卷2数学(文科)试题2020年全国普通高等学校统一招生考试试验检测卷2数学(理科)试题2013年全国普通高等学校招生统一考试理科数学(山东卷)人教A版(2019) 选择性必修第一册 必杀技 第一章 空间向量与立体几何 1.4 空间向量的应用 1.4.2 用空间向量研究距离、夹角问题 课时2 用空间向量研究夹角问题人教B版(2019) 选择性必修第一册 必杀技 第一章 空间向量与立体几何 1.2 空间向量在立体几何中的应用 1.2.4 二面角浙江省金华市曙光学校2020-2021学年高二下学期期中数学试题山西省朔州市怀仁市第九中学校2022-2023学年高二上学期期末数学试题