设O为原点, =(3,1), =, ⊥,∥,试求满足+=的的坐标.
设O为原点, 
=(3,1), 
=(-1,2), 
⊥
,
∥
,试求满足
+
=
的
的坐标.
=(3,1), =(-1,2), ⊥,∥,试求满足+=的的坐标.在线课程
解析:设=(x,y),
则=+=(x+3,y+1),
=-=(x+4,y-1).
由⊥,得-(x+3)+2(y+1)=0,
即x-2y+1=0. ①
由∥
,得3(y-1)-(x+4)=0,
即x-3y+7=0. ②
由①②联立,解得x=11,y=6,
即
坐标为(11,6).
