若x:y:z=2：3:4且2x+y-z=9,试求2x+3y+z的值

已知x:y:z=2:3:4,且x-y+z=36,求x+y+z的值. 已知x:y:z=2:3:4,且x+y+z=18,求x,y,z的值 若x:y:z=2:3:4且2x+y-z=9,试求2x+3y+z的值 已知x+y/2=y+z/3=z+x/4,且x+2y+z=12,求x-2y+z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 若2分之x+y=3分之y+z=5分之x+z 且x+y+z=18 求x,y,z的值 若x:y:z=2:3:4,求x+y+z/x-2y+3z的值 若x/3=y/4=z/5,求x+y+z/3x-2y+z的值. 若x/2=y/3=z/4不等于0,求x+y+z/x+y-z的值 若x=2分之y=3分之z,且x+y+z=12,试求2x+3y+4z的值 若3x+7y+9z=8且x+3y+4z=2,求x+y+z的值. 若x/3=y=z/4,且xy+xz+yz=76,求2x*x+12y*y+9z*z的值