求与三个点A(3,7,-4),B(-5,7,-4),C(-5,1,-4)的距离都相等的点的轨迹.
设该点P(x,y,z)则: (x-3)2+(y-7)2+(z+4)2=(x+5)2+(y-7)2+(z+4)2=(x+5)2+(y-1)2+(z+4)2 ∴直线 {x=-1 y=4
求与三个点A(3,7,-4),B(-5,7,-4),C(-5,1,-4)的距离都相等的点的轨迹.
设该点P(x,y,z)则: (x-3)2+(y-7)2+(z+4)2=(x+5)2+(y-7)2+(z+4)2=(x+5)2+(y-1)2+(z+4)2 ∴直线 {x=-1 y=4