1 . 若向量
表示小船沿东北方向行驶了
,则向量
和
的意义分别是什么?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfa08e0041bef349ec46e48a0800f5dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6960cfeeb67cb018b5c98015b56fe897.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e4bf6dd0ce736a14e3cf219b7b7d706.png)
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名校
2 . 若
,设
,则
的值为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7131d2b8191d127bf219b75a0671d48f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d55c4fe87b25ac76de34488f24688239.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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2021-03-23更新
|
461次组卷
|
5卷引用:沪教版(2020) 必修第二册 高效课堂 第八章 平面向量 每周一练(1)
沪教版(2020) 必修第二册 高效课堂 第八章 平面向量 每周一练(1)(已下线)6.2.3向量的数乘运算(练习)-【高效课堂】2021-2022学年高一数学下学期同步精讲课件+课后巩固练(人教A版2019必修第二册)福建省永定第一中学2022-2023学年高一下学期第一次阶段考试数学试题福建省泉州市第六中学2022-2023学年高一下学期期中模块测试数学试题(已下线)6.2.3向量的数乘运算【第二练】“上好三节课,做好三套题“高中数学素养晋级之路
3 . 下列命题正确的是( )
A.单位向量都相等 | B.若![]() ![]() ![]() |
C.![]() | D.若![]() ![]() ![]() ![]() ![]() ![]() |
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4 . 点C在线段
上,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7a8a071a58168a13919329f1466b597.png)
_________
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1eaa3c66636f90177f56e5b4797b1c67.png)
_________
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7a8a071a58168a13919329f1466b597.png)
_________
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9e349cbd86990b2182b9bd8594bb928.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7a8a071a58168a13919329f1466b597.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9795e7f5cb9b366776c41d8f3f43942.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1eaa3c66636f90177f56e5b4797b1c67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9795e7f5cb9b366776c41d8f3f43942.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7a8a071a58168a13919329f1466b597.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d792a2aa25763e14cc2863be3887000.png)
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5 . 下列命题中正确的是( )
A.![]() | B.![]() |
C.![]() | D.![]() |
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2021-08-15更新
|
419次组卷
|
8卷引用:吉林省五地六市联盟2018-2019学年高一下学期期末考试数学试题
6 . 化简:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62615893fb843e9e17c732e2d3c295b1.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62615893fb843e9e17c732e2d3c295b1.png)
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21-22高一·全国·课后作业
7 . 向量的数乘的定义
一般地,我们规定实数
与向量
的积是一个_____________ ,这种运算叫做向量的________ ,记作
,它的长度与方向规定如下:
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9c139d27621724eb44180efa8c7326.png)
_____________ .
(2)
的方向![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39c843fd00aec9372e3d4e041b2d5f99.png)
由(1)知,当
时,
.由(1)(2)可知,
.
一般地,我们规定实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69715409978b6bbc1d253bf09d41a112.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9c139d27621724eb44180efa8c7326.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df6ae848af966718dfed120bd3883404.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39c843fd00aec9372e3d4e041b2d5f99.png)
由(1)知,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/558e11d700481dc414d5d073b4b88a3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6ebb215e473c34199bff42cc214cd41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf6c454bb6ece1dd20782e86744e679d.png)
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8 . 已知D为△ABC的边BC的中点,E为AD上一点,且
,若
,试用
表示
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4312452250a6d3282aeda6e8717656c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46927389fcb9c1ab2d8fb4bc1e60793a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b88ba9793e29f928835fff5c2f48150f.png)
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21-22高一·全国·课后作业
9 . 向量数乘的运算律
设
为实数,那么
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c31171c788208bf52104e6dd34e3171.png)
___________ .
(2)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df4d63acb0779e5d8f5041c47bfbdde8.png)
___________ .
(3)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6523160db58cded0f15d41b8545ad396.png)
__________ .
特别地,我们有
,
.
设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ec6fb9e0625b85be3103d317fbb0cca.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c31171c788208bf52104e6dd34e3171.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df4d63acb0779e5d8f5041c47bfbdde8.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6523160db58cded0f15d41b8545ad396.png)
特别地,我们有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7e3db328de7bc0aa6c2341fba63ed9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a67bb00dc9cfdf5fc56cdc83c3d9203.png)
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解题方法
10 . 如图,已知向量
,
,求作向量
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a445e72c9e1025fd125db16165cbe76b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/19/4d8ba251-c9a6-4a6e-a071-ad48c31fec59.png?resizew=121)
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