名校
1 . 如图,已知四棱锥
中,
平面
为等边三角形,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/9589ce2e-890e-4a61-b18c-23a14b80c5c3.png?resizew=204)
(1)求证:
平面
;
(2)若
,求平面
与平面
所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f30533da2e1d2a958dc906c37eba9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed35808d0a9c4eb0fad0cee828a140f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6e8831817ee6f6e1df1fe5b2f0e3c67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/9589ce2e-890e-4a61-b18c-23a14b80c5c3.png?resizew=204)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7767d492158189b23af332a8016ed37d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27db558e8db4c957654c8e5cecd2d2dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bc46688d8723cf2003fc25890265200.png)
您最近一年使用:0次
2022-02-15更新
|
449次组卷
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4卷引用:山东省聊城市第二中学2021-2022学年高三下学期第一次测评数学试题
2 . 如图,已知圆柱的上,下底面圆心分别为
是圆柱的轴截面,正方形ABCD内接于下底面圆Q,
.
![](https://img.xkw.com/dksih/QBM/2021/12/21/2877184706306048/2916904990130176/STEM/69f5bc23f7314f5c8dabf6d4b54890aa.png?resizew=126)
(1)当k为何值时,点Q在平面PBC内的射影恰好是△PBC的重心;
(2)若
,当平面PAD与平面PBC所成的锐二面角最大时,求该锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f54840995c545df777ab9196813ddc5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667206277277c8a79bd370cb167a6acd.png)
![](https://img.xkw.com/dksih/QBM/2021/12/21/2877184706306048/2916904990130176/STEM/69f5bc23f7314f5c8dabf6d4b54890aa.png?resizew=126)
(1)当k为何值时,点Q在平面PBC内的射影恰好是△PBC的重心;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ad013ed89855a7f3c795c48bc7c91f1.png)
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2022-02-15更新
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2卷引用:山东省潍坊市2021-2022学年高三上学期学科核心素养测评数学试题
解题方法
3 . 2020年初,新冠肺炎疫情袭击全国,给人民生命财产安全和生产生活造成了严重影响.在党和政府强有力的领导下,全国人民众志成城,取得了抗击疫情战争的重大胜利,社会生产、生活全面恢复正常.某中学结合抗疫组织学生到一工厂开展劳动实习,加工制作临时隔离帐篷.将一块边长为6m的正方形材料先按如图1所示的阴影部分截去四个全等的等腰三角形(其
),然后,将剩余部分沿虚线折叠并拼成一个四棱锥型的帐篷(如图2),该四棱锥底面
是正方形,从顶点
向底面作垂线,垂足恰好是底面的中心.则直线
与平面
所成角的正弦值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a46c7d094dee04acfddf3a7715a1cb9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://img.xkw.com/dksih/QBM/2022/2/8/2911971240001536/2916813414424576/STEM/38014140-3362-4c5e-8356-3cf825fe91c1.png?resizew=357)
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2022-02-15更新
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3卷引用:山东省济宁市泗水县2021-2022学年高二上学期期中数学试题
4 . 如图,在四棱锥P-ABCD中,
,底面四边形ABCD为菱形,
,
,异面直线PD与AB所成的角为60°.试在①PA⊥BD,②PC⊥AB,③
三个条件中选两个条件,使得PO⊥平面ABCD成立,请说明选择理由,并求平面PAB与平面PCD所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a23f01af749100e1888bba06268843db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb96e0331eebe80ed1ff610faf531fe.png)
![](https://img.xkw.com/dksih/QBM/2022/1/12/2892964070768640/2916783846989824/STEM/0975599b-bc21-42d1-a27d-6b84cd1c4815.png?resizew=177)
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名校
解题方法
5 . 在图1中,
和
都是直角三角形,
,
,
.将
沿
折起,使得
,如图2.
![](https://img.xkw.com/dksih/QBM/2021/12/28/2882140139085824/2916504734695424/STEM/aadcd9a1-2efa-44c7-829d-502b0ca38d38.png?resizew=322)
(1)证明:平面
平面
;
(2)若
、
分别为
、
的中点,求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1baa1c07becd03537beeb09a31745cf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fcc9a4a6d0ad203358b16760fadc2d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf410aab32ba002b2c4e7343e7efd4c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8915e8e775538d41debf1933102c6b86.png)
![](https://img.xkw.com/dksih/QBM/2021/12/28/2882140139085824/2916504734695424/STEM/aadcd9a1-2efa-44c7-829d-502b0ca38d38.png?resizew=322)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d7090639341730951c1bc3c9b6164e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/115b32a22c3bfa823fe164d956bb1503.png)
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名校
解题方法
6 . 在空间直角坐标系
中,若平面
的一个法向量
,直线
的一个方向向量为
,则直线
与平面
所成角的正弦值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5e336d6ca2cae3d6e6c3810d7e521a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1745576d5903c7fb03fe6274541ece11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae715c996c1a6b5e35a3807c671bd6e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
您最近一年使用:0次
2022-02-14更新
|
239次组卷
|
2卷引用:山东省德州市第一中学2021-2022学年高二上学期12月月考数学试题
7 . 如图,在四棱锥
中,
面ABCD,
,且
,
,
,
,
,N为PD的中点.
![](https://img.xkw.com/dksih/QBM/2022/1/19/2897651621871616/2916194618597376/STEM/740cf214-11bf-47b2-865b-6c6e713500d7.png?resizew=185)
(1)求证:
平面PBC;
(2)在线段PD上是否存在一点M,使得直线CM与平面PBC所成角的正弦值是
.若存在,求出
的值,若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c1ac2e11788860424508ea9e80cf89d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc532cfe64300cb3da9e04a307c957a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://img.xkw.com/dksih/QBM/2022/1/19/2897651621871616/2916194618597376/STEM/740cf214-11bf-47b2-865b-6c6e713500d7.png?resizew=185)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc1b1a1e1538266e4e46b21dfd943fb7.png)
(2)在线段PD上是否存在一点M,使得直线CM与平面PBC所成角的正弦值是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/241a37fb1eff68a7133822b1b52d627e.png)
您最近一年使用:0次
2022-02-14更新
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486次组卷
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3卷引用:山东省枣庄市2021-2022学年高二上学期期末数学试题
山东省枣庄市2021-2022学年高二上学期期末数学试题(已下线)解密15 空间向量与立体几何 (讲义)-【高频考点解密】2022年高考数学二轮复习讲义+分层训练(全国通用)福建省漳州市第一外国语学校(漳州八中)2021-2022学年高二下学期期中考试数学试题
解题方法
8 . 如图,在长方体
中,
,
,
,M为
上一点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/bda2a714-0c45-4b11-ad77-91aa9e83f49c.png?resizew=152)
(1)求点
到平面
的距离;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55a2310cbba5e050488cd9296eb195d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06fa0a286a55692e4263a5993b01580b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/bda2a714-0c45-4b11-ad77-91aa9e83f49c.png?resizew=152)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34a7494edc88340385272679347b6af2.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be9f77293b0d1c80ca3bdf17656cc6f7.png)
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2022-02-13更新
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268次组卷
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2卷引用:山东省菏泽市2021-2022学年高二上学期期末数学试题
名校
解题方法
9 . 如图,在三棱锥
中,平面
平面
,
是以
为斜边的等腰直角三角形,
,
,O为AC的中点,M为
内部或边界上的动点,且
平面
.
![](https://img.xkw.com/dksih/QBM/2022/1/19/2898050092130304/2915727180488704/STEM/a8696f2d-2169-4039-9eea-17b68ff764a4.png?resizew=203)
(1)证明:
.
(2)设直线PM与平面ABC所成角为
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/603de302cb6fa781b16a0be8c828c7a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa1211fdbcc2a4a36e24b4e6c5c920bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://img.xkw.com/dksih/QBM/2022/1/19/2898050092130304/2915727180488704/STEM/a8696f2d-2169-4039-9eea-17b68ff764a4.png?resizew=203)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccbd1316b9d1f0c1e71fd078deec61f6.png)
(2)设直线PM与平面ABC所成角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de7d5ef3a3d9a03be91135fc426d57cc.png)
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2022-02-13更新
|
333次组卷
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2卷引用:山东省菏泽市2021-2022学年高三上学期期末数学试题
10 . 在正方体
中,E,F分别是
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/c4bd3897-caaf-4ee5-a519-6d71e3093c9b.png?resizew=174)
(1)求证:
∥平面
;
(2)求平面
与平面EDC所成的二面角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/c4bd3897-caaf-4ee5-a519-6d71e3093c9b.png?resizew=174)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ceb1b5e60049532ac79c4d00eddb74a9.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ceb1b5e60049532ac79c4d00eddb74a9.png)
您最近一年使用:0次
2022-02-13更新
|
472次组卷
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3卷引用:山东省滨州市2021-2022学年高二上学期期末数学试题
山东省滨州市2021-2022学年高二上学期期末数学试题(已下线)三省三校2022届高三下学期第一次模拟数学(理)试题变式题16-20江苏省泰州市罗塘高级中学2021-2022学年高二下学期期中数学试题