若x+y+z=3y=2z,则x/x+y+z=?

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)= 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) X/10=Y/8=Z/9,则X+Y+Z/2Y-3Z 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3x-2y+5z/x+y+z= 若x/3=y/2=z/5,则2x-3y-z/x-y+z= 若方程组2x+3y-z=0,x-3y-z=0,则x：y：z=? 若2x=3y=5z,则3x-2y+z/x+y-z 若方程组：x+y-2z=0,3x+y-z=0,则x：y：z= 若x:y:z=3:2:1,则x+2y-z/2x-y+z= (x+y-z)(x-y+z)= 若|x+3|+|y-2|+|2×z+1|=0求(x×z-y×z)(y-x+z)的值 若4x-3y-6z=0,x+2y-7z=0,则x+y+z/3x-y+z=? 若{x+3y+10z=0 则 (x+y-z)/(x-y+z){2x-y-2z=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 证明 ：x/(y+z)+y/(z+x)+z/(x+y)>=3/2其中 x,y,z>0