4x-3y-3z=0(1)x-3y+z=0(2)(1)-(2):3x-4z=0x=4z/3代入(1):16z/3-3y-3z=0y=7z/9(1)x:y:z=4z/3:7z/9:z=12:7:9(2)[9(x^2)+(9y)^2]/z^2=[(16z^2)+(7z)^2]/z^2=65
4x-3y-3z=0……1x-3y+z=0……21-2=3x-4z=0x=4/3z-3y=-7/3zy=7/9zx:y:z=12:7:9=65/9