题目
题型:不详难度:来源:
OA |
OB |
2π |
3 |
OC |
OA |
OC |
OA |
OB |
A.1 | B.2 | C.
| D.4 |
答案
OC |
OA |
OB |
OA |
OC |
OA |
OB |
OA |
∴0=2m+mkcos
2π |
3 |
1 |
2 |
故选D.
核心考点
试题【已知|OA|=1,|OB|=k,∠AOB=2π3,点C在∠AOB内,OC•OA=0,若OC=2mOA+mOB(m≠0),则k=( )A.1B.2C.3D.4】;主要考察你对平面向量的基本定理及坐标表示等知识点的理解。[详细]
举一反三
a |
b |
(1)求
a |
b |
(2)当k为何值时?k
a |
b |
a |
b |
(3)设向量
a |
b |
a |
b |
a |
a |
b |
A.-
| B.
| C.1 | D.2 |
AB |
a |
b |
c |
a |
b |
c |
c |