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(a-b)**2+(b-c)**2+(c-a)**2=0
wxyz
(wxyz)
这可是基本功啊！！
(#340478@0)
Last Updated: 2002-1-19
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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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