| a |
| b |
| a |
| a |
| b |
| b |
=9+2|
| a |
| b |
故|
| a |
| b |
| 3 |
故答案为3
| 3 |
已知|OA|＝|a|＝3，|OB|＝|b|＝3，∠AOB=60°，则|a+b|= _ ．
已知|
|＝|a|＝3，|
|＝|b|＝3，∠AOB=60°，则|
+
|= ___ ．
| OA |
| OB |
| a |
| b |
数学人气：181 ℃时间：2019-09-21 03:49:55
优质解答
|
+
|2=
2+2
•
+
2
=9+2|
||
|cos60°+9=27
故|
+
|=3
故答案为3
=9+2|
故|
故答案为3
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