x/2=y/3=z/4,则x+2y-z/z=?

若x+y+z=3y=2z,则x/x+y+z=? x+2y=3x+2z=4y+z 求x:y:z x+y/2=z+x/3=y+z/4 x+y+z=27 若x,y,z成等差数列,则(z-x)^2-4(x-y)(y-z)= x/2=y/3=z/4,则x+2y-z/z=? 试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y) 已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z X/10=Y/8=Z/9,则X+Y+Z/2Y-3Z 已知：4x-5y+2z=0 x+4y-3z=0则：(x*x+y*y+z*z)/(x*y+y*z+z*x)=____. 2x+z=10 x+y-z=4 3x-y-z=0 x=y/z=z/3,x+y+z ＝12,求2x+3y+4z是多少, 已知x/2=y/3=z/4,则2x+y-z/3x-2y+z=? 已知(x+2y)/2=(y+3z)/3=(z+4x)/4,则x:y:z=? x+2y+3z=10,4x+3y+2z=15则x+y+z= 若x/2=y/3=z/4,则3x-2y+5z/x+y+z= 2x+y+3z=10,3x+4y+2z=15,则x+y+z= 已知2x-y-z=0,3x+4y-2z=0,则x：y：z=? 已知(x+2y)/3=(y+3z)/4=(z+5x)/5,则x:y:z=