1 . 已知
,则下列式子正确的是( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb3ae623890e99e3a5d5db7289040920.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2 . 化简![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9a7b11679538454e1d9a3794f1a3c12.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9a7b11679538454e1d9a3794f1a3c12.png)
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3 . 如果
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d065cc787d5e5f62e421fd8866509e1.png)
________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ca3a0942ed7b1cd21c6360e1d3fdcdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0cec9c97977dd9269fbb410bad21025.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d065cc787d5e5f62e421fd8866509e1.png)
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12-13高一下·山西临汾·期中
4 . 设点
,
,若点
在直线
上,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcb67a2589d13cc4495b6065344dbb8a.png)
,则点
的坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d295a4cc3a58f9f38ee98337313c81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f3cd3027a533dd07220f161c958602.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcb67a2589d13cc4495b6065344dbb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c588df8f04308739172d47026046be3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
A.![]() | B.![]() | C.![]() ![]() | D.无数多个 |
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5 . 若非零向量
,且设
,则实数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5085e3cdef9ea6c564e079f745d6fdb.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae109f6cae08b1b804d2174b94f6f01b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdc27e2827b1bf7c24985c4a5199c84c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5085e3cdef9ea6c564e079f745d6fdb.png)
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23-24高一下·全国·课前预习
6 . 向量数乘的运算律
设λ,μ为实数,那么:
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97194effa5bb27e17646acc5a5eac558.png)
_______ . (2)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7667e5a02abdd3dfd368713d13515e4e.png)
_______ . (3)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dff3214264280a1d978d30cfcc4eff90.png)
_______ .
设λ,μ为实数,那么:
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97194effa5bb27e17646acc5a5eac558.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7667e5a02abdd3dfd368713d13515e4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dff3214264280a1d978d30cfcc4eff90.png)
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7 . 相反向量
定义 | 如果两个向量长度 |
性质 | ① 对于相反向量有:![]() |
② 若a、b互为相反向量,则![]() ![]() | |
③ 零向量的相反向量仍是零向量 | |
推论 | ① ![]() ![]() ② 如果a与b互为相反向量,那么 ![]() ![]() ![]() |
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23-24高一下·全国·课前预习
8 . 向量的数乘运算的概念
一般地,规定实数λ与向量
的积是一个_______ ,这种运算叫做向量的数乘,记作_______ ,它的长度与方向规定如下:
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d2984c6a16070b31bff26bf31970c9f.png)
_______ .
(2)当
时,
的方向与
的方向_______ ;当
时,
的方向与
的方向_______ ;
当
时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ca81c659691339bd98ee3505b2584a7.png)
_______
注意:
是实数,
是向量,它们的积
仍然是向量.实数与向量可以相乘,但是不能相加减,如
均没有意义.
一般地,规定实数λ与向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d2984c6a16070b31bff26bf31970c9f.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3be362dec96173f246ff747264007817.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ecc0b35db23f16a3f01b6edc660b6a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380cca64859b15c565b5b65c49438c5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ecc0b35db23f16a3f01b6edc660b6a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/558e11d700481dc414d5d073b4b88a3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ca81c659691339bd98ee3505b2584a7.png)
注意:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ecc0b35db23f16a3f01b6edc660b6a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf9fba9e6ae893e3a8c0002008ece9fb.png)
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