一道数学方程式题2x+3y+4z=12.24x+2y+3z=11.93x+4y+2z=11求xyz

x:y:z=2:3:4且x+y+z=18求xyz 方程组:x-2y+4z=0,2x+3y-3z=0...xyz不等于0,求(2x+y-z)\(2x-y+z) 已知4x-3y+z=0,x+2y-8z=0,xyz不等于0,求x+y-z/x-y+2z的值 数学已知xyz满足x-2y+3z=0,2x+3y+4z=0,求x:y:z x*x+y*y+2z*z-2x+4y+4z+7=0,求xyz的值 设X+Y+Z=0求X^3+X^2Z-XYZ+Y^2Z+Y^3的值 已知方程组4x-y+3z=0 2x+y+6z=0且xyz不等于0,则x/y+y/z+z/x是多少 方程组X:Y:Z=4:7:8,X+Y+2Z=54 求XYZ x=y/z=z/3,x+y+z ＝12,求2x+3y+4z是多少, 已知：x+y-z=4x^2+y^2-z^2=12x^3+y^3-z^3=34求xyz 已知有理数x.y.z满足（x-z-2)^2+(3x-6y-7)^2=/3y+3z-4/=0求xyz=多少 已知x/2=y/3=z/4且xyz不等于0,求2x+3y-z/x-3y+z拜托各位了 3Q