两方程联立,消去z,得:(x-1/2)^2+(y-1/2)^2=1/2
所以在XOY平面投影方程为:(x-1/2)^2+(y-1/2)^2=1/2
同理可得在XOZ和YOZ平面内投影分别是:3z-z^2+4x-2x^2+2xz-2=0和3z-z^2+4y-2y^2+4yz-2=0
两方程联立,消去z,得:(x-1/2)^2+(y-1/2)^2=1/2
所以在XOY平面投影方程为:(x-1/2)^2+(y-1/2)^2=1/2
同理可得在XOZ和YOZ平面内投影分别是:3z-z^2+4x-2x^2+2xz-2=0和3z-z^2+4y-2y^2+4yz-2=0