题目内容
已知向量
=(1,1),
=(2,0),则|2
+
|等于______.
| a |
| b |
| a |
| b |
∵向量
=(1,1),
=(2,0),
∴2
+
=2(1,1)+(2,0)=(4,2),
所以|2
+
|=
=
=2
故答案为:2
| a |
| b |
∴2
| a |
| b |
所以|2
| a |
| b |
| 42+22 |
| 20 |
| 5 |
故答案为:2
| 5 |
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题目内容
| a |
| b |
| a |
| b |
| a |
| b |
| a |
| b |
| a |
| b |
| 42+22 |
| 20 |
| 5 |
| 5 |