若x,y,z成等差数列,则(z-x)^2-4(x-y)(y-x)=

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成等差数列,则（Z-X）^2-4（X-Y）（Y-Z）等于 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)=_____ 求证成等差数列.求证：x,y,z成等差数列.若(z-x)^2-4(x-y)(y-z). 若1/X 1/y 1/z 成等差数列,求证:(Y-Z-X)/X (Z+X-Y)/Y (X+Y-Z)/z也成等差数列越快越好 若5,x,y,z,21成等差数列,则x,y,z为. 若1,x,y,z,7成等差数列,则z—x=___ 一直X.Y.Z,成等差数列,求证x^2(y+z),y^2(z+x),z^2(x+y)成等差数列 设x,y.z为实数,2x.3y.4z是等比数列,1/x,1/y.1/z是等差数列,则(x/z)+(z/x)是多少? 非零实数x、y、z成等差数列,x+1,y,z与x,y,z+2分别成等比数列,则y等于? 设x,y,z是实数,若9x,12y,15z成等比数列,且1/x,1/y,1/z成等差数列,则x/z+z/x= 若三个正数a,b,c成等比数列,三数x,y ,.z 成等差数列,则（y-z)lga+(z-x)lgb+(x-y)lgc= 设X,Y,Z为实数,2X,3Y,4Z成等比数列,且1／X,1／Y,1／Z成等差数列,则X/Z+Z/X的值是 已知x,y,z∈R,若-1,x,y,z,-3成等差数列,则x+y+z的值为? 已知三个实数x,y,z满足条件(z-x)^2-4(x-y)(y-z)=0,求证:x,y,z成等差数列 若x+y+z=3y=2z,则x/x+y+z=?