题目内容
已知向量
=(4,6),
=(3,5),且
⊥
,
∥
,则向量
=______.
| OA |
| OB |
| OC |
| OA |
| AC |
| OB |
| OC |
设向量
=(x,y)
∵
=(4,6),
∴
=
-
=(x-4,y-6),
∵
⊥
,
∥
,
∴4x+6y=0,①
5(x-4)-3(y-6)=0,②
∴x=
,y=-
∴
=(
,-
)
故答案为:(
,-
)
| OC |
∵
| OA |
∴
| AC |
| OC |
| OA |
∵
| OC |
| OA |
| AC |
| OB |
∴4x+6y=0,①
5(x-4)-3(y-6)=0,②
∴x=
| 2 |
| 7 |
| 4 |
| 21 |
∴
| OC |
| 2 |
| 7 |
| 4 |
| 21 |
故答案为:(
| 2 |
| 7 |
| 4 |
| 21 |
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