问题
选择题
已知点B(1,-2),C(2,0),且 2
|
答案
∵2
-AB
=(5,-1),∴AC
+AB
=(5,-1),CB
∵
=(-1,-2),∴CB
=(5,-1)-(-1,-2)=(6,1).AB
故选B.
已知点B(1,-2),C(2,0),且 2
|
∵2
-AB
=(5,-1),∴AC
+AB
=(5,-1),CB
∵
=(-1,-2),∴CB
=(5,-1)-(-1,-2)=(6,1).AB
故选B.