已知xyz=03x+2y-7z=0 7x+4y-15z=0求(4x^2-5y^2-6z^2)/x^2+2y^2+3z^2
x*x+y*y+2z*z-2x+4y+4z+7=0,求xyz的值
已知x+y-7z=0 x-2y+5z=0(xyz不等于0),求x+2y-z/y-2x+12z
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
已知有理数x,y,z满足(x-z-2)^2+(3x-6y-7)^2+|3y+3z-4|=0求xyz的值
已知xyz不等于0,且x+2y-z=0,7x-y-z=0,求x+y+z/2x-y-z的值.
已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值
已知有理数x、y、z满足条件|x-z-2|+(3x-6y-7)^2+|3y+3z-4|=0,求x、y、z
方程组:x-2y+4z=0,2x+3y-3z=0...xyz不等于0,求(2x+y-z)\(2x-y+z)
已知一方程组:x-3y+7z=0与x-2y+4z=0(xyz≠0),求x:y:z.
已知xyz满足x-2y+z=0 7x+4y-5z=0,求y+z分之x的值