1 . 已知
的顶点为
、
、
,三个点坐标为
,
,
,求
、
、
、
、
及
的余弦值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/d411824b225a056aa362e714ad49cfd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071d1677dfd123a6fef5944e46aaa1d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b69e2cb0f4be91a9fae40252a60e9d0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9795e7f5cb9b366776c41d8f3f43942.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be64d59ac6538a0f4d79fb825e082081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf2743c965e63b856f45c9e581fcf719.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d13569ca8ba25448253a6f9260227764.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3b89e7ff008dea7530bdc4ea5b6419d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
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解题方法
2 . 在等腰梯形
中,已知
,
,
,
,动点
,
分别在线段
和
上,线段
和
相交于点
,且
,
.
![](https://img.xkw.com/dksih/QBM/2021/5/12/2719660078292992/2794703230705664/STEM/d768bd4b-3d05-4bd5-a9ff-a2237daa6214.png?resizew=257)
(1)当
时,求
的值.
(2)记
,试求函数
的解析式及其最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd8e727e4efc22b49649f71ae9c9d84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94e0aec1f2c457fb25e263274efbd6f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/203d221ac5daf6139edfeba77557ee38.png)
![](https://img.xkw.com/dksih/QBM/2021/5/12/2719660078292992/2794703230705664/STEM/d768bd4b-3d05-4bd5-a9ff-a2237daa6214.png?resizew=257)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3cf0f585938ede9eca890a6eb326d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f4de28076d6973795ac348b14790382.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92a5216d03ad0fb70b6d99a1dc681fbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/419cc846921b034a219e175af2085669.png)
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解题方法
3 . 已知向量
,
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46b47b2797dd757bcf163f5a84cb81ef.png)
_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f7c0ac4a534ebba243b8a60eb4dea81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95fd21f36a44024fc056a7a9c6c8c870.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb7e15ea8375995ca729cc235b0c98f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46b47b2797dd757bcf163f5a84cb81ef.png)
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名校
解题方法
4 . 已知平面向量
,
,
,且
,
.
(1)求向量
和向量
;
(2)求
和
夹角和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee43b6d802195783ff92c612e782a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c94a582e8423ec830a9daddada2909f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/237711e2743d70304f966090d2bc091c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70facc9bc02af0867d248407bd317c05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7557713682c09ec526718378189f9f7e.png)
(1)求向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb573cc0f30d5c32cdad1510793f0e7b.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb573cc0f30d5c32cdad1510793f0e7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27c250094127e2b3c878d68213b60407.png)
您最近一年使用:0次
2021-08-23更新
|
252次组卷
|
2卷引用:湖南省长沙卓华高级中学2020-2021学年高一下学期第三次月考数学试题
5 . 下列关于平面向量的说法中不正确 的是( )
A.![]() ![]() ![]() ![]() ![]() |
B.若![]() ![]() ![]() |
C.若![]() ![]() ![]() ![]() |
D.若点![]() ![]() ![]() |
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解题方法
6 . 已知向量
,
,
.
(Ⅰ)求
;
(Ⅱ)若向量
是单位向量,且
与
共线,求
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6569e50f43b3d8645652ecc13b62066e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fda31d7cbc3ee5de962806c251afc2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec1cc86b7ff004a6ab4f88b7af2d58da.png)
(Ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(Ⅱ)若向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb573cc0f30d5c32cdad1510793f0e7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/441b83f50b3a9452693467b342b7ab04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec42c3751963b1ab1f0cf16df8701bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb573cc0f30d5c32cdad1510793f0e7b.png)
您最近一年使用:0次
名校
7 . 在平面直角坐标系
中,已知点
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7c6eefb0805a1d3e2cc906405f70aa3.png)
(1)以线段
,
为邻边作平行四边形
,求向量
的坐标和
;
(2)设实数
满足
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d96ef7e9efc2681546f2320b108a1987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e33238c8bd6859507da092650c7a7450.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7c6eefb0805a1d3e2cc906405f70aa3.png)
(1)以线段
![](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/ea51de5ca1c2879e7a767a60ce4624cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bd98a891fa65f2fc6688001b03185d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a015f4d775bc6502a4ab5237f53f31d6.png)
(2)设实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42ae3934003fabbe378caac5f7e65a6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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2021-08-07更新
|
426次组卷
|
4卷引用:江苏省南京市“校际联合体”2020-2021学年高一下学期期末联考数学试题
解题方法
8 . 如图,已知
为平面直角坐标系的原点,
,
.
![](https://img.xkw.com/dksih/QBM/2021/7/9/2760561971257344/2778281061425152/STEM/6f64ce5deabf419e90c13e5b41afb17e.png?resizew=159)
(1)求
的坐标;
(2)若四边形
为平行四边形,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef869895c438448f3fd8f1de95e729e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3a877205dce8becbe43d3bf50348430.png)
![](https://img.xkw.com/dksih/QBM/2021/7/9/2760561971257344/2778281061425152/STEM/6f64ce5deabf419e90c13e5b41afb17e.png?resizew=159)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20ec3efaa6b6ff5769e8999df5714a9.png)
(2)若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/200dedc8042e076a069bc0a70b32271f.png)
您最近一年使用:0次
2021-08-03更新
|
248次组卷
|
2卷引用:河北省邯郸市2020-2021学年高一下学期期末数学试题
9 . 已知
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969b84e5780ec399174ff46e85f714a6.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/417800be340040970d3ded66004739b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8da1d6632647adf54cb698a549c74859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969b84e5780ec399174ff46e85f714a6.png)
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名校
解题方法
10 . 已知向量
,则
与
的夹角为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0294c9935fa174904e0fdbe5dd8a928f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2021-07-29更新
|
667次组卷
|
8卷引用:辽宁省葫芦岛市2020-2021学年高一下学期期末数学试题