Why do you do such easy questions? n*n*n-n*n-4=(n-2)(n*n+n+2), so it is a composite number.

bigsquirrel (小松鼠)
2002-1-20 -04:00
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Back To Topic: 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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