" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
= a2-ab+ab-b2
=a2-b2
(a x b ) + (a x -b) + (b x a) + (b x -b)
ab + (-ab) + ba + (-b pangkat2)
-ab - b pangkat 2