若X:Y:Z=2:7:5且X-2Y+3Z=6求X+y+z的值

若xyz≠0且4(x/z)-5(y/z)=-2,(x/z)+4(y/z)=3,求x:y:z 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 设|x|-|y|+|z|=|x+y+z|,且|x+y|=4,|y+z|=5,|y|=3,求(x-y-z)^2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? 若X:Y:Z=5:6:7那么(Y-X):(Y+Z)和(X+2Y+3Z):(3X+2Y+Z) 若z≠0,且4x=7y+5z,2x+y=z,求x,y,z的值 若x:y:z=2:7:5,且x-2y+3z=6,则x= ,y= ,z= 若X:Y:Z=2:7:5且X-2Y+3Z=6求X+y+z的值 若X:Y:Z=2:7:5且X-2Y+3Z=6求X+y+z的值 已知2x+3y-4z=7 3x-2y+z=3 x+5y+9z=20 则 x+y+z= 若x :y :z=2 :3 :7 .且 x-2y+3z=34 则 x= y= z=? 如果x/2=y/7=z/5,且x*y*z不等于零,则(x+y+z)/(3x-y)=______. 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满足x-2y+z=0且7x+4y-5z=0,求x:y:z的值 若(4x-3y-3z)^2+|x-3y-z|=0 且xyz不等于0 则4x+y-z/x+y+z 的值 三元一次方程组题目x+y-z=11 y+z-x=5 x-y+z=1x+y=4 y+z=3 x+z=5若已知x-3y+2z=0 2x+3y-8z=0, 且xyz≠0,则x:y:z= 已知xyz不等于0,且{x+3y+5z=0 x2+3y+z=0,则x.x+y.y-2z.2z/3x.3x+2y.2y+z.z=? {x+y+z=1;x+3y+7z=-1;z+5y+8z=-2 若x+y+z=3y=2z,则x/x+y+z=?