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113桃園高中

回覆 7# r91 的帖子

x^3 + y^3 + z^3 - 3xyz= (x+y+z)(x^2+y^2+z^2-xy-yz-zx)
= (x+y+z)1/2 ((x-y)^2+(y-z)^2+(z-x)^2))
= 2024/2  (1+1+4) =6072

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