" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
= {p,q,r,s} + (r,t)
= {p,q,r,s,t}
yang
= (A+B) n C)
= (p,q,r,s,t,u) n {p,r,t}
= {p,q,r,t,s,t,u