若x+y=-z,则(x^2-y^2)+(xz-yz)的值是___

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,y,z成等差数列,则(z-x)^2-4(x-y)(y-x)= 若x+y+z=2,x^2-（y+z）^2=8,则x-y-z=多少? 若x:y:z=3:2:1,则x+2y-z/2x-y+z= 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x-y+z=-4,x^2-(y+z)^2=8,则x+y+z=如题 若2x=3y=5z,则3x-2y+z/x+y-z 若方程组2x+3y-z=0,x-3y-z=0,则x：y：z=? 若方程组：x+y-2z=0,3x+y-z=0,则x：y：z= 若4x=7y+5z,2x+y=z,则x:y:z的值为 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-z)=_____ 已知x+y+z不等于0,若2y+z/x=2x+y/z=2z+x/y=k,则k= 若x+y+z≠0且2y+z/x=2x+y/z=2z+x/y=k,则k=? 若x、y、z均不等于0,且2x+y-z=0 x+8y+2z=0,则x:y:z=? 若{x+3y+10z=0 则 (x+y-z)/(x-y+z){2x-y-2z=0