若3x+5y+6=0,3x+y-7z=0则x+y-z的值等于()
4x-3y-6z=0,x+2y-7z=0是一个方程组,那么x-y+z/x+y+z的值等于
若2x+5y+4z=0,3x+y-7z=0,则x+y-z的值等于( )
已知实数x,y,z满足:3x-y-3z=0和x-6y+6z=0(z≠0),则代数式x+y+z/x-y+z的值等于
若{x+3y+10z=0 则 (x+y-z)/(x-y+z)
已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值
已知有理数x,y,z满足|x-z-2|+|3x-6y-7|+(3y+3z-40)^2=0,求x,y,z的值
如果x/2=y/7=z/5,x,y,z都不等于0,则(x+y+z)/(3x-y)等于多少?
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4x-3y-6y=0,x+2y-7z=0.求x-y+z\x+y+z的值
已知实数XYZ满足3X-y-3Z=0和X-6Y+6Z=0(Z不等于0),则代数式X+Y+Z/x-Y+Z的值等于
若3x+5y+6z=5,4x+2y+z=2,则x+y+z的值等于【】
若3x+5y+6z=5,4x+2y+z=2,则x+y+z的值等于( )