RTX=3Y ,Y=2Z,求X:Y:Z

x=y/z=z/3,x+y+z ＝12,求2x+3y+4z是多少, 如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y, 试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y) 如果,根号x-3+| y-2 |+z^2=2z-1 求 （x+z)^y 已知3x=4y,2y=5z,试求x:y:z 3x=4y 2y=5z 试求x:y:z x y z x+y--- = --- = ---- ----y+Z z+x x+y ,求 z 的值 .求 x+y---- 已知x/3=y/4=z/2,求x+2y-z/x+y+z=? 已知 3x-y+2z=0 2x+y-3z=0,求x :y :z. 2分之x=3分之y=5分之z x+y+z=20 求x,y,z x/3=y/4=z/5,求x+y+z/3x-2y+z的值, 若x/3=y/4=z/5,求x+y+z/3x-2y+z的值.