已知2/x=3/y=4/z求4x^2+2yz+z^2/x+y+z*x-y-z/8x^2+4yz+2z^2的值

已知x/3=y/4=z/2,求x+2y-z/x+y+z=? 已知2x+5y+4z=6 3x+y-7z=-4求x+y-z 已知X:Y:Z=3:4:5,求4X+3Y-2Z/X+Y+Z的值 已知x/4=y/5=z/6 求x+y+z/3x-2y+z的值 已知x/4=y/5=z/6,求x+y+z/3x-2y+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+z-y=36求x+y+z的值 已知x:y:z=2:3:4,且x+z-y=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. 已知{x-5y+2z=0 3x-5y-4z=0,求x：y:z 已知x:：y：z=3：4：5,(1)求x+y分之z的值；（2）若x+y+z=6,求x,y,z. 已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z 1、已知x/y=7/2,求x/x+y 2、已知x/2=y/3=z/4,求x+y+z/2x+3y-z!1、已知x/y=7/2,求x/x+y2、已知x/2=y/3=z/4,求x+y+z/2x+3y-z! 已知:2X-3y+2z=0,x+4Y-9/2z=0求:X:Z的值.X:y:Z的值.X+2y+X/X+y+Z的值. 已知:2X 已知x/2=y/3=z/4,求下列各式 （1）(x+y+z)/x (2)(x-y+2x/(x-y-2z) 已知：x+2y+3z=2,3x+y+2z=3,2x+3y+z=4,求x+y+z的值 已知x+2y+3z=2 3x+y+2z=3 2x+3y+z=4求X+Y+Z的值 已知X+Y/2=Y+Z/3=Z+X/4,且2X+4Y+6Z=120,求X,Y,Z的值