若x/2=y/3=z/4≠0,则2x+3y/z=——；已知2a=3b,则a/b=——.

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4x-3y-6z=0,x+2y-7z=0,则x+y+z/3x-y+z=? 若(4x-3y-3z)^2+|x-3y-z|=0 且xyz不等于0 则4x+y-z/x+y+z 的值 若x+y+z=3y=2z,则x/x+y+z=? 若xyz≠0且4(x/z)-5(y/z)=-2,(x/z)+4(y/z)=3,求x:y:z 2x+z=10 x+y-z=4 3x-y-z=0 已知：4x-5y+2z=0 x+4y-3z=0则：(x*x+y*y+z*z)/(x*y+y*z+z*x)=____. 若方程组2x+3y-z=0,x-3y-z=0,则x：y：z=? 若x/2=y/3=z/4,则3x-2y+5z/x+y+z= 已知{x-3y+2z=0 3x-3y-4z+0,则x:y:z=? 已知x-2y+3z=0,x-3y+4z=0,则x:y:z= 若方程组：x+y-2z=0,3x+y-z=0,则x：y：z= 已知2x-y-z=0,3x+4y-2z=0,则x：y：z=? x+2y-4z=0,3x+y-z=0,则x:y:z=?：： x+2y-4z=0 3x+y-z=0,则x:y:z= 已知x+4y-3z=0,4x-5y+2z=0,则x：y：z 已知方程组4x-5y+2z=0 x+2y=3z 则x:y:z 若x/2=y/3=z/4不等于0,求x+y+z/x+y-z的值