1 . 如图,三棱锥
中,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/74bc1ee7-06c0-4723-87f0-0115ef232b1b.png?resizew=182)
(1)求证:
;
(2)求
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a9b8e7befcb7881c294070175b1a554.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b94d1563aaaef62c1643614a732931e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080ca48cd27d4bf9d9ef084b558fc17a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eea78bf026d76f1cb9cc3dc9349a193.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/74bc1ee7-06c0-4723-87f0-0115ef232b1b.png?resizew=182)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bafa8c14100a4f847b41b9148954116c.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
您最近一年使用:0次
2 . 如图,在四棱锥S-ABCD中,
平面
,底面ABCD为直角梯形,
,
,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c8f7251f98b8d6354782afd37462896.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/a9f0a270-64e5-40bc-bc50-3bf1a65c51c1.png?resizew=165)
(Ⅰ)求
与平面
所成角的正弦值.
(Ⅱ)若E为SB的中点,在平面
内存在点N,使得
平面
,求N到直线AD,SA的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10c83f8945042b9c8fb2fbdac9308d62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9060f03b9ee41d70d135b1e1a8902ce9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c8f7251f98b8d6354782afd37462896.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/a9f0a270-64e5-40bc-bc50-3bf1a65c51c1.png?resizew=165)
(Ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/defa5b53043ae802bb1af7d14374406d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cc6f6dfdbe7d39891c35f67e1a95c7f.png)
(Ⅱ)若E为SB的中点,在平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d923a338dd2d2e29336b42574d38448.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa00966462971fe7856c033f8cb1b821.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cc6f6dfdbe7d39891c35f67e1a95c7f.png)
您最近一年使用:0次
名校
3 . 已知两条不同的直线
,
和一个平面
,则使得“
”成立的一个必要条件是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72fbc714c63815dad9a27418f6492f16.png)
A.![]() ![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() ![]() ![]() |
您最近一年使用:0次
2019-06-21更新
|
909次组卷
|
6卷引用:湖北省武汉市华科附中、吴家山中学等五校2019-2020学年上学期高二数学期末试题
4 . 如图所示,在几何体
中,四边形
是菱形,
平面
,
,且
,
.
(1)证明:平面
平面
;
(2)若二面角
是直二面角,求异面直线
与
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662698361c6b3ddaf0c28a3c87be53e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c0e8ed73e5faa2fb6c1ac5e5a9836ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/179071147b940f5e2f80e74526cebf92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e46571701ccaa18d3c844ab99ee6c30e.png)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8dc6db50a9709c3f4d84eee7bdf1250.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2443a94bed3d2b1f95c04ebd61ac134a.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a34e44c5d7e1d22521fb293994f5b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/b4f8982d-17aa-43c5-96da-011e6649d2df.png?resizew=210)
您最近一年使用:0次
5 . 如图所示,直三棱柱
中,
是边长为2等边三角形,
是
的中点.
(1)求证:
平面
;
(2)若
与平面
所成角为
,求
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ede6a60cad0e0b58e1549fda6e085719.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9178fc8b5d65aa75fa9196294a0db7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca43c6d158c63be017c0637eaaecb2bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ba9e20d667d04bf3ee7f55cc795ce01.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d8eb4a9f462ca0c1d49c3fe91e720d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01b899be3c4709ec661d84392b167230.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d8eb4a9f462ca0c1d49c3fe91e720d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41104641f3e2260d00aeadf8fb8a078a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/336df647-4d72-4c7a-987e-aefaa49ce482.png?resizew=180)
您最近一年使用:0次
6 . 如图所示,在平行四边形
中,
,
,将它沿对角线
折起,使二面角
的大小为
,则点
与点
之间的距离为_________ ;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c3e9ef3e849788645552cfb0735d987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3d69c69c46ac34f560546c22af120be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c909cd1b6f3fa1ec39eb245e8f5c11c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/1a676d9e-98bf-49e3-958e-5ab5e0097282.png?resizew=161)
您最近一年使用:0次
名校
7 . 如图所示,在空间四边形OABC中,
,点
在线段
上,且
,
为
中点,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee477d164d38ff067fc4ce342cf6d380.png)
_____________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7c352e14b2b9aeeac42e67f263048af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebe72d1b634f1e89d8699e605e7d46af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5109c111f8b8d5c586b7d4bfcafc2162.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee477d164d38ff067fc4ce342cf6d380.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/a2e160bd-24fb-4360-a8ed-432b6be3aa58.png?resizew=149)
您最近一年使用:0次
2019-04-17更新
|
1301次组卷
|
8卷引用:【校级联考】湖北省四校(襄州一中、枣阳一中、宜城一中、曾都一中)2018-2019学年高二下学期期中联考数学(理)试题
【校级联考】湖北省四校(襄州一中、枣阳一中、宜城一中、曾都一中)2018-2019学年高二下学期期中联考数学(理)试题【全国百强校】江苏省沭阳县修远中学2018-2019学年高二下学期第二次月考数学(理)试题天津市静海区第六中学2020-2021学年高二上学期第一次月考数学试题(已下线)1.2 空间向量基本定理-2020-2021学年高二数学课时同步练(人教A版选择性必修第一册)江西省景德镇市第一中学2021-2022学年高二上学期期中数学(理)试题河南省郑州市第七中学2022-2023学年高二上学期第一次月考数学试题广东省广州市天河中学2023-2024学年高二上学期基础考试数学试题广东省东莞市第十高级中学2023-2024学年高二上学期12月期中考试数学试题
8 . 已知向量
,则下列向量中与
成
的夹角的是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfb8c4ab37e542eb833cbc5935be0e19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969604545902c9a66549a4a44ec3a3c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e5fa72f2878b476bc57f0df12d6555.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
9 . 我国齐梁时代的数学家祖暅提出了一条原理:“幂势既同,则积不容异”.意思是:两个等高的几何体若在所有等高处的水平截面的面积相等,则这两个几何体的体积相等.椭球体是椭圆绕其轴旋转所成的旋转体.如图,将底面直径都为
,高皆为
的椭半球体和已被挖去了圆锥体的圆柱放置于同一平面
上,用平行于平面
且与平面
任意距离
处的平面截这两个几何体,可横截得到
及
两截面.可以证明
总成立.据此,半短轴长为1,半长轴长为3的椭球体的体积是_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8231c13e8a6f86250faf3df6b14fdce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cf4ca38dd88abe1906764a913f89a11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9907b710022afe51c7ff377fc472f683.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3521e5848342f1bcad027fb616208dd3.png)
![](https://img.xkw.com/dksih/QBM/2019/4/4/2175264621789184/2176598841499648/STEM/8406dcf0-9436-4980-8fd5-7270068fb7dd.png?resizew=419)
您最近一年使用:0次
2019-04-06更新
|
786次组卷
|
4卷引用:【市级联考】湖北省十堰市2018-2019学年高二下学期第一次月考文科数学试题
【市级联考】湖北省十堰市2018-2019学年高二下学期第一次月考文科数学试题【市级联考】福建省龙岩市2019届高三第一学期期末教学质量检查数学(理科)试题【全国百强校】安徽省六安市第一中学2019届高三高考模拟(四)数学(文)试题(已下线)押第13题 推理与证明-备战2021年高考数学(文)临考题号押题(全国卷2)
名校
10 . 如图所示,二面角
为
,
是棱
上的两点,
分别在半平面内
,且
,
,
,
,
,则
的长______ .
![](https://img.xkw.com/dksih/QBM/2019/3/26/2169054127112192/2170394739605504/STEM/5df431a791a94542945db47ba30ddd12.png?resizew=246)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/754bbd99327195520a4ca3ce3b9a0577.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3c032441543354c154ee67d744abb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e288596fa3811dd2c17bded60e82e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c638fb895acd987140d0ca6bef097499.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb0a2d7d40a6c0bf1fddb802db381689.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d71e6ea7333dbc78d0a7b9bc3892f940.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/2019/3/26/2169054127112192/2170394739605504/STEM/5df431a791a94542945db47ba30ddd12.png?resizew=246)
您最近一年使用:0次
2019-03-28更新
|
2357次组卷
|
7卷引用:湖北省仙桃市田家炳实验高级中学2023-2024学年高二上学期期中数学试题