X+2Y-9Z=0,X-2Y-5Z=0(X,Y,Z不等于0) x:y
x分之y+z=y分之z+x=z分之x+y(x+y+z不等于0),求x+y+z分之x+y-z
已知x+y-7z=0 x-2y+5z=0(xyz不等于0),求x+2y-z/y-2x+12z
X+2Y-9Z=0,X-2Y-5Z=0(X,Y,Z不等于0) x:y
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
若x/2=y/3=z/4不等于0,求x+y+z/x+y-z的值
X+2Y-9Z=0,X-2Y-5Z=0(X,Y,Z不等于0),求代数式X平方-4Y平方+9Z平方,分之,2X平方+3Y平
若xy-z不等于0,且(y+x)/x=(z+x)/y=(y+x)/z,求[(y+z)(z+x)(x+y)]/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4x-3y+z=0,x+2y-8z=0,xyz不等于0,求x+y-z/x-y+2z的值
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x+y+z不等于0,若2y+z/x=2x+y/z=2z+x/y=k,则k=