若｛3x-4y=0 7x=4z.则x+y+z/x =

若4x-3y-6z=0,x+2y-7z=0,则x+y+z/3x-y+z=? 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=? 若3x-4y=0,7x=4z,则x+y+z/x= 若｛3x-4y=0 7x=4z.则x+y+z/x = 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=? 已知{4x-3y-6z=0、x+2y-7z=0,则x-y+z：x+y+z= 已知,方程组:4x-3y-7z=0 x+2y=10z 则(x-y+z)÷(x+y+z)=—— 若x,y,z成等差数列,则(z-x)^2-4(x-y)(y-z)= 若x,y,z成等差数列,则(z-x)^2-4(x-y)(y-x)= 联立方程x+3y-5z=0,2x+4y+7=0,xyz不等於0,则y/x+z/y+x/z= 已知 x-3y+z=0 3x-3y-4z=0,则x:y:z=已知x-3y+z=0 3x-3y-4z=0则x:y:z= 若2x+5y+4z=0 ,3x+y=0；则x+y-z=? 已知：4x-5y+2z=0 x+4y-3z=0则：(x*x+y*y+z*z)/(x*y+y*z+z*x)=____. 三元一次方程组题目x+y-z=11 y+z-x=5 x-y+z=1x+y=4 y+z=3 x+z=5若已知x-3y+2z=0 2x+3y-8z=0, 且xyz≠0,则x:y:z= 若x/2=y/3=z/4,则x+y+z/x=多少?