摘要：9．如图.平面内有三个向量,其中的夹角为1200.的夹角为300.且.若.则的值为
网址：http://m.1010jiajiao.com/timu3_id_541147[举报]
其中
与
的
夹角为60°, 
、
,若
的值为 （ ）
C．
如图，平面内有三个向量：| OA |
| a |
| OB |
| b |
| OC |
| c |
| a |
| c |
| a |
| b |
| b |
| c |
| a |
| b |
| c |
| 3 |
| c |
| a |
| b |
如图，平面内有三个向量| OA |
| OB |
| OC |
| OA |
| OB |
| OA |
| OC |
| OA |
| OB |
| OC |
| 3 |
| OC |
| OA |
| OB |
如图，平面内有三个向量：如图，平面内有三个向量网址：http://m.1010jiajiao.com/timu3_id_541147[举报]
如图，平面内有三个向量：| OA |
| a |
| OB |
| b |
| OC |
| c |
| a |
| c |
| a |
| b |
| b |
| c |
| a |
| b |
| c |
| 3 |
| c |
| a |
| b |
如图，平面内有三个向量| OA |
| OB |
| OC |
| OA |
| OB |
| OA |
| OC |
| OA |
| OB |
| OC |
| 3 |
| OC |
| OA |
| OB |
如图，平面内有三个向量
如图，平面内有三个向量