3x+4y-5z=0求解答,x,y,z的值

3x+4y-5z=0求解答,x,y,z的值 已知2x+3y-4z=0,3x+4y+5z=0,求x+y+z/（除以）x-y+z的值. 已知{3x+4y+5z=0,2x+3y-4z=0,求x+y+z/x-y+z的值. 2x+3y-4z=0,3x+4y+5z=0,求x+y-z/x-y+z的值 已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值 4x-3y-3z=0 x-3y+z=0 并且X Y Z不等于0 求x:z 和y:z的值 方程组｛4x-3y-3z=0,x-3y+z=0,(x.y.z不等于0),求x/z和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 若|x-3|+|y+4|+z-5|=0,求代数式x+y-z的值 已知2x+3y-4z=0,3x+3y+5z=0,求x+y+x/x-y+z的值 已知x,y,z满足方程组：4x-5y+2z=o;x+4y-3x=0,求x:y:z的值 解答初三数学题啊{ x+y=z+x=y+z 2 3 4 分数线我就不打了）设线段X.Y.Z满足 { x+y+z=27 求x.y.z.的值 一只x/3=y/4=z/5,求x+y+z/x及x+y+z/x-y+z的值 已知X:Y:Z=3:4:5,求4X+3Y-2Z/X+Y+Z的值 若x/3=y/4=z/5,求x+y+z/3x-2y+z的值. 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 已知x/3=y/4=z/6≠0,求x+y-z/x-y+z的值