3x-4y=0 x+y+z 若{7x=4z ,则————= x

若4x-3y-6z=0,x+2y-7z=0,则x+y+z/3x-y+z=? 若3x-4y=0,7x=4z,则x+y+z/x= 若｛3x-4y=0 7x=4z.则x+y+z/x = 若{x-3y+z=0,3x+3y-4z=0,则x:y:z=? 若3x+7y+z=5,4x+10y+z=3,则x+y+z=? X-Y-Z=0 X+Y-3Z=4 2X-5Y+7Z=21 若x/2=y/3=z/4不等于0,求x+y+z/x+y-z的值 1.{x:y:z=3:4:5 2x+3y-5z=-142.{x-y-z=-1 3x+5y+7z=11 4x-y+2z=-13.{x+y=1 x+z=0 2x+y+2z=44.{x-y+z=-3 2x-y-z=-2 -3x+y+z=-15.{x-y+z=-3 3x+y-4z=6 2x+y-z=36.{x-2y+5z=16 2x+y-5z=7 2x-y+z=38 若x+2y-9z=0,x-2y+5z=0,(x.y.z≠=0)求2x平方+3y平方+7z平方/x平方-4y平方+4z平方 2x+z=10 x+y-z=4 3x-y-z=0 若(4x-3y-3z)^2+|x-3y-z|=0 且xyz不等于0 则4x+y-z/x+y+z 的值 已知4x-3y-6z=0,x+2y-7z=0,则x-y+z/x+y+z=_________ 已知4x-3y+6z=0 x+2y-7z=0 则x-y+z/x+y-z=? 4x-3y-6z=0,x+2y-7z=0,x-y+z/x+y+z=? 已知{4x-3y-6z=0、x+2y-7z=0,则x-y+z：x+y+z= 已知4x-3y-6z=0,x+2y-7z=0,求5x+2y-z/2x-3y-10z 已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值 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