已知A(-3,0),B(0,3)O为坐标原点,点C在∠AOB内,且∠AOC=60°,设OC=λOA+OB(λ∈R),则λ等于(  ) A.33 B.3 C.13 D.3

问题描述:

已知A(-3,0),B(0,

3
)O为坐标原点,点C在∠AOB内,且∠AOC=60°,设
OC
=λ
OA
+
OB
(λ∈R),则λ等于(  )
A.
3
3

B.
3

C.
1
3

D. 3

OC
=λ
OA
+
OB
,∠AOC=60°
OA
|=
3
tan60°
=1

又∵|OA|=3
λ=
1
3

故选项为C