Question

求到两定点P1(-2,-3,1),P2(1,2,3)的距离相等的点的轨迹方程

Answer 1

(x,y,z)

(x+2)^2+(y+3)^2+(z-1)^2=(x-1)^2+(y-2)^2+(z-3)^2

化简么

3x+5y+2z=0