若|x-2|+|y+3|+|z-5|=0,求|x|+|y|+|z|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
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-z=0,2x-y+2z=0 求(3x-2y+5z)/(5x-3y+2z)的值
已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值
已知x,y,z,同时满足方程x+3y-5z=0,2x-y-3z=0求x:y:z的值
已知{3x+4y+5z=0,2x+3y-4z=0,求x+y+z/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2x+3y-4z=0,3x+4y+5z=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
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,满足3x+2y+z=5,2x+y-3z=1.y是非负数.求z的取值范围