M mathcrazy New member Sep 5, 2010 #1 let's see who's smart enough out there to prove these -(a-b) = -a +b and (a-b)+(b-c) = a - c best answer will be voted ;-)
let's see who's smart enough out there to prove these -(a-b) = -a +b and (a-b)+(b-c) = a - c best answer will be voted ;-)
