若x,y,z成等差数列,则(Z-X)^2-4(X-Y)(Y-Z)等于
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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)等于
若x,y,z成等差数列,则(Z-X)^2-4(X-Y)(Y-Z)等于
(z-x)^2-4(x-y)(y-z)
(z-x)^2=(x-z)^2=[(x-y)+(y-z)]^2
[(x-y)+(y+z)]^2-4(x-y)(y-z)
(x-y)^2+(y-z)^2-2(x-y)(y-z)
[(x-y)-(y-z)]^2=0
(x+z-2y)^2=0
x,y,z成等差数列,所以x+z-2y=0
(Z-X)^2-4(X-Y)(Y-Z)等于0
希望采纳····
0
就算不去计算,,猜都猜的到。。
z-x)^2-4(x-y)(y-z)
(z-x)^2=(x-z)^2=[(x-y)+(y-z)]^2
[(x-y)+(y+z)]^2-4(x-y)(y-z)
(x-y)^2+(y-z)^2-2(x-y)(y-z)
[(x-y)-(y-z)]^2=0
(x+z-2y)^2=0
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