已知点O(0,0),向量OA=(2,3),OB=(6,-3),点P是线段AB的三等分点,求点P的坐标?
问题描述:
已知点O(0,0),向量OA=(2,3),OB=(6,-3),点P是线段AB的三等分点,求点P的坐标?
答
1)若AP:PB=1:2则 xp=(xa+xb/2)/(1+1/2)=(2+6/2)/(3/2)=10/3yp=(ya+yb/2)/(1+1/2)=(3-3/2)/(3/2)=1即点P的坐标:(10/3,1)【2)若 AP':P'B=2则 xp'=(xa+2xb)/(1+2)=(2+6*2)/3=14/3yp'=(ya+2yb)/(1+2)=(3-2*3)/3=-1...