线段定比分点计算公式若在一直线上三点P1 ,P ,P2有 P 1P = λ PP2 ,且P ( x1 ,y1 ),P2 ( x2 ,y2 ),P ( x,y )则x= (x1 + λ x2 )/(1+ λ) y = (y1 + λ y2)/( 1+ λ)  ,...