己知A(1,-1),B(2,2),C(3,0)三点,求点D的坐标,使直线CD⊥AB,且CD//AD,

问题描述:

己知A(1,-1),B(2,2),C(3,0)三点,求点D的坐标,使直线CD⊥AB,且CD//AD,

设D(X,Y),等下向量AB*向量CD=0向量CD=m向量AD1*(x-3)+3*y=0;(x-3)*1=y*(x-1)