B(x,y)
AB{x-1,y+2}
(x-1)/2=(y+2)/3 ,y+2=1.5(x-1) ,(1)
|AB|^2=4*13=(x-1)^2+(y+2)^2 ,(2)
(1)代入(2):
(x-1)^2*(1+1.5*1.5)=52
|x-1|=4
x= 5 ,y=4 or x=-3,y=-8 (舍)
B(5,4)
B(x,y)
AB{x-1,y+2}
(x-1)/2=(y+2)/3 ,y+2=1.5(x-1) ,(1)
|AB|^2=4*13=(x-1)^2+(y+2)^2 ,(2)
(1)代入(2):
(x-1)^2*(1+1.5*1.5)=52
|x-1|=4
x= 5 ,y=4 or x=-3,y=-8 (舍)
B(5,4)