20-21高一·全国·课后作业
1 . 给出下列命题:
①若
=
,则A、B、C、D四点是平行四边形的四个顶点;
②在
中,一定有
=
;
③若
,
,则
=
;
④若![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a92e6eba8dab638fd66831cd3a0b6d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31ef428bd9de9bc875b343feded3c7.png)
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/427fa45527d0ce469bfd060bf6f991f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31ef428bd9de9bc875b343feded3c7.png)
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a92e6eba8dab638fd66831cd3a0b6d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31ef428bd9de9bc875b343feded3c7.png)
.
其中所有正确命题的序号为________ .
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1fe2d802f2b37e7db198c5a3c1df9a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66a584f11ff7ac3cfd1014f20187b196.png)
②在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1fe2d802f2b37e7db198c5a3c1df9a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66a584f11ff7ac3cfd1014f20187b196.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69005813b6862509e7e397995bda40c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6a7e519edfac1c359d1f1a7a1940797.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a92e6eba8dab638fd66831cd3a0b6d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/524594bf0942ed86f56fc1eee120a81a.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a92e6eba8dab638fd66831cd3a0b6d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31ef428bd9de9bc875b343feded3c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/427fa45527d0ce469bfd060bf6f991f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/427fa45527d0ce469bfd060bf6f991f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31ef428bd9de9bc875b343feded3c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/524594bf0942ed86f56fc1eee120a81a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a92e6eba8dab638fd66831cd3a0b6d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31ef428bd9de9bc875b343feded3c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/524594bf0942ed86f56fc1eee120a81a.png)
其中所有正确命题的序号为
您最近一年使用:0次
2 . 给出下列四个命题:
①方向相反的两个向量是相反向量;
②若
,
满足
且
,
同向,则
;
③不相等的两个空间向量的模必不相等;
④对于任意向量
,
,必有
.
其中正确命题的序号为________ .
①方向相反的两个向量是相反向量;
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28a587659cde0c5a4cea2ea02f68a1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec658f649403dc03a7978ce1d3c2456.png)
③不相等的两个空间向量的模必不相等;
④对于任意向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c8e7ee50a063a579c57250e2a93d97d.png)
其中正确命题的序号为
您最近一年使用:0次
2020-08-05更新
|
1449次组卷
|
6卷引用:北师大版(2019) 选修第一册 必杀技 第三章 2.2 课时1 空间向量的加减与数乘运算
北师大版(2019) 选修第一册 必杀技 第三章 2.2 课时1 空间向量的加减与数乘运算海南省海口嘉勋高级中学2021-2022学年高二10月月考数学试题 第六章平面向量章节检测—2021-2022学年高一上学期数学人教B版(2019)必修第二册人教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 1.1 空间向量及其运算 1.1.1 空间向量及其运算 课时1 空间向量及其线性运算人教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 1.1 空间向量及其运算 1.1.1 空间向量及其线性运算专题6.3《平面向量初步》(A卷基础篇)-2020-2021学年高一数学必修第二册同步单元AB卷(新教材人教B版)
3 . 在推导很多三角恒等变换公式时,我们可以利用平面向量的有关知识来研究,在一定程度上可以简化推理过程.如我们就可以利用平面向量来推导两角差的余弦公式:
.具体过程如下:
如图,在平面直角坐标系
内作单位圆
,以
为始边作角
,
.它们的终边与单位圆
的交点分别为A,B.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/ff7914f9-3736-4a49-b171-4c14d5491d7e.png?resizew=342)
则
,
,由向量数量积的坐标表示,有
.
设
,
的夹角为
,则
,
另一方面,由图(1)可知,
;
由图(2)可知
,于是
,
.
所以
,也有
;
所以,对于任意角
,
有:
.
此公式给出了任意角
,
的正弦、余弦值与其差角
的余弦值之间的关系,称为差角的余弦公式,简记作
.有了公式
以后,我们只要知道
,
,
,
的值,就可以求得
的值了.
阅读以上材料,利用图(3)单位圆及相关数据(图中M是AB的中点),采取类似方法(用其他方法解答正确同等给分)
解决下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/2652d775-a20f-41fd-944a-9d388f0b4a1d.png?resizew=274)
(1)判断
是否正确?(回答“正确”,“不正确”,不需要证明)
(2)证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff8eb79da2ae1202feebf45ba5e795c.png)
如图,在平面直角坐标系
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3e5af20b2f8c1fba4470f9650989e51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/ff7914f9-3736-4a49-b171-4c14d5491d7e.png?resizew=342)
则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92ab3f6bd216fc240a107a8dd7e1acdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af35399a864361859b2fc9abe4471a85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/437ebce60a1d755209353f0d94462154.png)
设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/588414d07bcedbf1e7d46d0d028e269d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5773af927ab0caa208eef1adf9e87aee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5351800b6c0891ab2946d1ccd2f6c2d.png)
另一方面,由图(1)可知,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/655ee7e11f540619722504916419e009.png)
由图(2)可知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18eedcc65589e7529da85a578bd0ecb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24483522263bb3d2c4275c993ef542e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45a173784888adf2946382fa093ba53a.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2084f038effd4b810eb59e6a9942684d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff8eb79da2ae1202feebf45ba5e795c.png)
所以,对于任意角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cd78eb0780bb4395457cc463763991d.png)
此公式给出了任意角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd927b4b5a7875528c1b54aa4bb8b2dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c5bcf44b6a1dd4daf8eca077ff72d4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c5bcf44b6a1dd4daf8eca077ff72d4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d66c03d4ca06819a6ce7fc8ea6de0f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eacde1c42151734fdc60f3001b590de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b4179e1ab8705cf19ea7aaf48888843.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63fe57d4fbae536de2e641d9d349fcf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbb006ea697b63a914eb487073f0abe1.png)
阅读以上材料,利用图(3)单位圆及相关数据(图中M是AB的中点),采取类似方法(用其他方法解答正确同等给分)
解决下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/2652d775-a20f-41fd-944a-9d388f0b4a1d.png?resizew=274)
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90f93aa4ff886e380c9b7c05dbafd08d.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d3ee14a51561c0eae1c74153cc76866.png)
您最近一年使用:0次
2016高一·全国·课后作业
4 . 给出下列说法:
(1)若
,则
或
;
(2)向量的模一定是正数;
(3)起点不同,但方向相同且模相等的几个向量是相等向量;
(4)向量
与
是共线向量,则
四点必在同一直线上.
其中正确说法的序号是________ .
(1)若
![](https://img.xkw.com/dksih/QBM/2016/11/1/1826272361955328/1826272362029056/STEM/3a78fe1387a94ffb98992206b5953cdb.png?resizew=48)
![](https://img.xkw.com/dksih/QBM/2016/11/1/1826272361955328/1826272362029056/STEM/7660144836334402abdfe3d1fe1643d9.png?resizew=37)
![](https://img.xkw.com/dksih/QBM/2016/11/1/1826272361955328/1826272362029056/STEM/ec8c3970be924ef48eab64a6e8dc2ec2.png?resizew=47)
(2)向量的模一定是正数;
(3)起点不同,但方向相同且模相等的几个向量是相等向量;
(4)向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436b63e793d6d39990341d29cf47f10.png)
![](https://img.xkw.com/dksih/QBM/2016/11/1/1826272361955328/1826272362029056/STEM/db064b2246af4da2a618dbe70de066bc.png?resizew=27)
![](https://img.xkw.com/dksih/QBM/2016/11/1/1826272361955328/1826272362029056/STEM/c240c84ee04d4e7ba3f865afe9c1b2a4.png?resizew=68)
其中正确说法的序号是
您最近一年使用:0次
2017-11-27更新
|
1506次组卷
|
3卷引用:安徽省滁州市定远县育才学校2020-2021学年高一下学期第三次月考理科数学试题
安徽省滁州市定远县育才学校2020-2021学年高一下学期第三次月考理科数学试题(已下线)同步君人教A版必修4第二章2.1平面向量的实际背景及基本概念高中数学人教版 必修4 第二章 平面向量 2.1 平面向量的实际背景及基本概念