若x/2=y/3=z/4,则(x+y+z)/xyz的值为( ) A.3/8 B.8/3 C.1/3 D无法确定

若x+y+z=3y=2z,则x/x+y+z=? 若x,y,z成等差数列,则(z-x)^2-4(x-y)(y-z)= 若x/2=y/3=z/4,则3x-2y+5z/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成等差数列,则(z-x)^2-4(x-y)(y-x)= 若x/2=y/3=z/4,则x+y+z/x=多少? x/2=y/3=z/4,则x+2y-z/z=? x+y/2=z+x/3=y+z/4 x+y+z=27 x+2y=3x+2z=4y+z 求x:y:z 若x/2=y/3=z/4 则2x+3y/z 等于? X/10=Y/8=Z/9,则X+Y+Z/2Y-3Z 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= 已知：4x-5y+2z=0 x+4y-3z=0则：(x*x+y*y+z*z)/(x*y+y*z+z*x)=____. 已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z 试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y) 若x/2=y/3=z/4则3x-2y+5z/x+y+x= 若{x-3y+z=0,3x+3y-4z=0,则x:y:z=?