题目内容
已知|
|=2,|
|=4,若
与
方向相反,则用向量
表示向量
为:
=______.
| a |
| b |
| b |
| a |
| b |
| a |
| a |
由题意得,|
|=
|
|,
与
方向相反,
故可得
=-
.
故答案为:
=-
.
| a |
| 1 |
| 2 |
| b |
| b |
| a |
故可得
| a |
| 1 |
| 2 |
| b |
故答案为:
| a |
| 1 |
| 2 |
| b |
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