1 . (1)若
与
都是单位向量,则
.( )
(2)平面内的任意两个向量都可以作为一组基底.( )
(3)平行向量的方向一定相同.( )
(4)若
,则
或
.( )
(5)若
的面积
,则
或
.( )
![](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/778542d99ab19e2ecc0c7ef75161f133.png)
(2)平面内的任意两个向量都可以作为一组基底.
(3)平行向量的方向一定相同.
(4)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2cc1f1ef9ad32eef62aefa4c3fc3d6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d065bd10f7ea1f05764e28f095f244f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aed3d85ea66827c00b5f7e4c5ae598a.png)
(5)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a72d02ca51ae5759ee8e5ca23d3ff0e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a6794a460487525552efedd7edc4df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd4c5016bd1fc6582078299b9cf8b392.png)
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