2(a*a+b*b+c*c)=2*(ab+ba+ac) > (a-b)^2 + (b-c)^2+(a-c)^2=0 >a=b,b=c,a=c

winger1234 (ben)
(#340550@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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