摘要：5．如图.平面内有三个向量OA,OB,OC,其中OA与OB的夹角为60°,OA与OC.OB与OC的夹角都为30°,且∣OA∣=∣OB∣=1, ∣OC∣=,若OC=OA+OB,则的值为( ) A．2 B． C． D．4
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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| OA |
| OB |
| OC |
| OA |
| OB |
| OA |
| OC |
| OA |
| OB |
| OC |
| 3 |
| OC |
| OA |
| OB |
如图，平面内有三个向量| OA |
| OB |
| OC |
| OA |
| OB |
| OA |
| OC |
| OA |
| OB |
| OC |
| 3 |
| OC |
| OA |
| OB |
2
-3
| 3 |
2
-3
．| 3 |
,若OC=
OA+
OB,
的值为 （
）
D．4