题目
题型:不详难度:来源:
OA |
OB |
2 |
OA |
OB |
OC |
OA |
OB, |
m |
n |
答案
![魔方格](http://img.shitiku.com.cn/uploads/allimg/20200206/20200206231903-67115.png)
则
OA |
OB |
2 |
∴
OC |
OA |
OB |
=(m,
2 |
∴tan45°=
| ||
m |
∴
m |
n |
2 |
故选B
核心考点
试题【已知|OA|=1,|OB|=2,OA•OB=0,点C在∠AOB内,∠AOC=45°,设OC=mOA+nOB,(m,n∈R),则mn=______.】;主要考察你对空间向量与立体几何等知识点的理解。[详细]
举一反三
A.4+8i | B.8+2i | C.2+4i | D.4+i |
AB |
AD |
A.
| B.
| C.
| D.
|
a |
b |
A.|
| B.|
| C.|
| D.|
|
![](http://img.shitiku.com.cn/uploads/allimg/20200206/20200206231654-86955.png)