(a-b)**2+(b-c)**2+(c-a)**2=0

wxyz (wxyz)
这可是基本功啊!!
(#340478@0)
2002-1-19 -05:00

回到话题: a math question thanks!! Suppose triangle ABC has side lengths a, b, c, Prove that if a*a+b*b+c*c=ab+bc+ac, then triangle ABC is an equilateral triangle.

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