若x,y,z成等差数列,则(z-x)^2-4(x-y)(y-x)=
1个回答
设公差为t,则 y=x+t,z=x+2t
题目可以化简为:(2t)^2-4(-t)*t=8t^2
相关问题
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-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).
1.若(z-x)2-4(x-y)(y-z)=0.求证:x,y,z成等差数列..
已知x,y,z成等差数列 求证:x2[y+z],y2[x+z],z2[x+y]成等差数列
设x,y,z成等差数列,代数式(x-z)平方+4(x-y)(z-y)=
已知x、y、z、∈R,3x,4y,5z成等比数列.1/x,1/y,1/z成等差数列,则z/x+x/z=__
若x-y+z=-4,x^2-(y+z)^2=8,则x+y+z=
若x+2y-4z=0 3x+y-z=0 则 x:y:z= ————
若2x+3y+4z=6,3x+2y+z=4,则x+y+z=