下列说法错误的是________ .
①平行向量一定相等;②不相等的向量一定不平行;③共线向量一定相等;④相等向量一定共线;⑤长度相等的向量是相等向量;⑥平行于同一个向量的两个向量是共线向量
①平行向量一定相等;②不相等的向量一定不平行;③共线向量一定相等;④相等向量一定共线;⑤长度相等的向量是相等向量;⑥平行于同一个向量的两个向量是共线向量
更新时间:2021-03-23 19:13:38
|
相似题推荐
填空题-单空题
|
较易
(0.85)
【推荐1】若有以下命题:
①两个相等向量的模相等; ②若
和
都是单位向量,则
;
③相等的两个向量一定是共线向量; ④
,
,则
;
⑤零向量是唯一没有方向的向量; ⑥两个非零向量的和可以是零.
其中正确的命题序号是___________ .
①两个相等向量的模相等; ②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4b7ca4667865ebe617fa6539e8d11fd.png)
③相等的两个向量一定是共线向量; ④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02f7d08d10754ff3903d139768f40530.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/277eb4f346558a40afb9dc8594e9a14f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcec2d25e171d2923a2ea1cad0491a65.png)
⑤零向量是唯一没有方向的向量; ⑥两个非零向量的和可以是零.
其中正确的命题序号是
您最近一年使用:0次
填空题-单空题
|
较易
(0.85)
解题方法
【推荐2】函数
,
上有五个点
,
,
,
,
,以这五个点为起点或终点的向量中相等的向量有________ .(任意写出其中的三对).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58c65d71e57e6e7697e2f627dcd58583.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e083a1a8485c3f5ed1e0ec7518096c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca1cfb0346710899b0cbb46b0c87373f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49cba284d675a3028d7a8d54f1f8ae70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/282229f075fb48afed2ea5a0fa46751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d1458d35d08cb9547589e943b4c60ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c978cfaa169c1fd9faa8082e3867599.png)
您最近一年使用:0次
填空题-单空题
|
较易
(0.85)
【推荐1】给出以下5个条件:①
;②
;③
与
的方向相反;④
或
;⑤
与
都是单位向量.其中能使
成立的是________ (填序号).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/778542d99ab19e2ecc0c7ef75161f133.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5025f108d00d5146d3acf9bd32473a09.png)
![](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/7e8e462f7905f8b2c9984a31b904f831.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0bd1f79c90b6ea8093fa59c0ce7479b.png)
![](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/66d76ee2e81f447f84a3e0b39c0388ef.png)
您最近一年使用:0次
填空题-单空题
|
较易
(0.85)
【推荐2】下列各命题中正确的命题是__________ .
①所有的单位向量都相等;
②向量的模是一个正实数;
③
中,必有
:
④若
均为非零向量,则
与
一定相等;
⑤若
与
同向,且
,则
;
⑥由于
的方向不确定,故
不与任何非零向量平行;
⑦若
,则存在唯一实数
,使
成立;
⑧设
是平面内两个已知向量,则对平面内的任意向量
,存在唯一实数对x,y,使得
,成立;
⑨
中,D,E,F分别是边
的中点,则
;
①所有的单位向量都相等;
②向量的模是一个正实数;
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e71163a9fd0b7c3b86d1c7f3267bde28.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e8b95a61af300412fc65f846089028.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cd8e4bf215f2769c84b3559508c8c24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7efc342fe2e7c9e0ce7a836e512ef389.png)
⑤若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d752281c61f6c09dfe975a75afd2b2a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f107e1dbb415f08c74769cf3544441d.png)
⑥由于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b12de8a4f788ff23d36e74c811354779.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b12de8a4f788ff23d36e74c811354779.png)
⑦若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91b958a367fa2f08b6202a5a6ebf5e9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5814266ed6bb60b7b58fe7e0f02eb48a.png)
⑧设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10814bc3db929e79874befe96cf4e3d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8df6d6a87e4c3f2ecf22dd0679ad756.png)
⑨
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/746ee1515a178948b04f535705c6f738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c9fbf69745aa70c5172303ec5374289.png)
您最近一年使用:0次