in

blaise ()
a*a+b*b>=2*a*b;
b*b+c*c>=2*b*c;
c*c+a*a>=2*c*a;
each = is true only if x==y


2(a*a+b*b+c*c)>=2(a*b+b*c+c*d)

the = is true only if
a==b==c
(#340463@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.

回到论坛: HOME枫下论坛枫下论坛主坛工作学习求学深造

URL:   
http://www.rolia.net/zh/post.php?f=0&p=340463