MathDB
Prove that they are equal

Source: INMO 2000 Problem 3

October 10, 2005
algebra solvedalgebra

Problem Statement

If a,b,c,xa,b,c,x are real numbers such that abc0abc \not= 0 and xb+(1x)ca=xc+(1x)ab=xa+(1x)bc, \frac{xb + (1-x)c}{a} = \frac{xc + (1-x)a}{b} = \frac{xa + (1-x) b }{c}, then prove that a=b=ca = b = c.