已知X/.3=Y/4=Z/5,且2X-2y+z=21,则x+y+z=

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：y：z=2：3：5,且3x+4z-2y=40,求x 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+Y/2=Y+Z/3=Z+X/4,且2X+4Y+6Z=120,求X,Y,Z的值 已知x+y/2=y+z/3=x+z/4 且2x+4y+6z=120,求x、y、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 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 已知x,y,z满足方程组x-2y+z=0 7x+4y-5z=0,且z不等于0,2x²-3y²+z²/y²-2z²的值为? 已知x.y.z满足x-2y+z=0且7x+4y-5z=0,求x:y:z的值 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4x-3y-6z=0,x+2y-7z=0,且x,y,z≠0,求2x+3y+6z/x+5y+5z的值. 已知x:y:z=3:4:5且2x-3y+2z=8,则x-2y-2z的植为急, 已知x:y:z=3:4:5且2x-3y+2z=8,则x-2y-2z的植为 已知X/.3=Y/4=Z/5,且2X-2y+z=21,则x+y+z= 已知x/2=y/3=z/5,且3x+4z-2y=40,求x y z的值.