若x-y+z=-4,x^2-(y+z)^2=8,则x+y+z=如题

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)= 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 (x*x+2)(y*y+4)(z*z+8)=64xyz,求x,y,z 若（z-x)的平方-4(x-y)(y-z)=0试确定x-2y+z若（z-x)^2-4(x-y)(y-z)=0试确定x-2y+z 若实数XYZ满足2|x-y|+√2y+z+z方-z+1//4=0 求X+Y+Z 2y+z在根号里 若x/2=y/3=z/4,则3x-2y+5z/x+y+z= 若x-y+z=-4,x^2-(y+z)^2=8,则x+y+z=如题 若（z-x）^2-4(x-y)(y-z)=0,试说明:x-2y+z=0 若(z-x)^2-4（x-y）（y-Z)=0,试说明x-2y+z=0. 若4x=7y+5z,2x+y=z,则x:y:z的值为 若x/3=y/4=z/5,求x+y+z/3x-2y+z的值. 若x/2=y/3=z/4不等于0,求x+y+z/x+y-z的值 若(z-x)的二次方-4(x-y)(y-z)=0,求证x-2y+z=0 若x:y:z=2:3:4,求x+y+z/x-2y+3z的值 若(z-x)2-4(x-y)(y-z)=0,求x+z-2y+2009如题