已知8x-2y-3z=0,5x+y-12z=0(z不等于0)求x:y:z
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+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x/2=y/3=z/4,且x+y+z不等于0,求2x+3y-4z/x+y+z的值
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4x-3y-3z=0,x-3y+z=0(z不等于0)求x:z,y:z
已知4x-3y-3z=0,① x-3y+z=0,②并且z不等于0,求x:z与y:z
已知x,y,z满足{4x-3y-3z=0,x-3y+z=0.(x不等于0,y不等于0,z不等于0)求x/z和y/z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5分之X+Y=6分之Y+Z=7分之x+z,且X,Y,Z都不等于0,求X:Y:Z的值
若x/2=y/3=z/4不等于0,求x+y+z/x+y-z的值
已知3x=4y=5z,且x不等于0,求2x-3y+6z/3x-2y+4z=?