求点A(2,3,1)在直线(x+7)/1=(y+2)/2=(z+2)/3上的投影点的坐标.
直线的方向向量υ1={1,2,3},设该投影点坐标为{x0,y0, z0},则有: (x0+7)/1=(y0+2)/2=(z0+2)/3;(x0-2)+2(y0-3)+ 3(z0-1)=0 解得: {x0=-5 y0=2 ∴该点为(-5,2,4)
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