已知3x-4y-z=0.2x+y-z=0,且xyz=0,求x+2y-3z/3x-2y+3z
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
已知4x-3y+z=0,x+2y-8z=0,xyz不等于0,求x+y-z/x-y+2z的值
已知x+y-z/z=x-y+z/y=-x+y+z/x,且xyz不等于0,求分式[(x+y)(x+z)(y+z)]/xyz
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
已知xyz不等于0,且x/3=y/4=z/5,求【2x-3(2y-z)】/x+y+z
已知:(x+y-z)/z=(x-y+z)/y+(y+z-x)/x,且xyz≠0,求代数式[(x+y)(y+z)(x+z)
方程组:x-2y+4z=0,2x+3y-3z=0...xyz不等于0,求(2x+y-z)\(2x-y+z)
x:y:z=2:3:4且x+y+z=18求xyz
设X+Y+Z=0求X^3+X^2Z-XYZ+Y^2Z+Y^3的值
已知x/2=y/3=z/4,且x+y+z不等于0,求2x+3y-4z/x+y+z的值
已知方程组2x-3y+z=0 3x-2y-6z=0 且xyz不等于0求 x:y:z
已知方程组x-3y-2z=0,2x-y+z=0,且xyz不等于0,求x:y:z.