1.若3x+5y+6=0,3x+y-7z=0则x+y-z的值是?
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{x+3y+10z=0 则 (x+y-z)/(x-y+z)
已知x^3+y^3-6x+2y+z+3+10=0,求(x-y+z)(x+y-z)的值.(z+3)是绝对值
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
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
若4x-3y-6z=0,x+2y-7z=0,求代数式5x*5x+2y*2y-z*z/2x*2x-3y*3y-10z*10
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2x+5y+4z=0,3x+y-7z=0,则x+y-z的值等于( )
若2x+5y-4z=0,3x+9y-7z=0,则x+y-z的值为
2x+2y+z=0 ,3x+5y+z=0,那么x+2y/x+y+z的值是