now I am studying the concept of reflexive, symmetric etc.... I need to see a real solution, I have no idea how to solve these 2 problems.
Thank you for helping me
You may well laugh at that situation.
But a wise guy such as youself is surely capable of learning to use LaTeX.
Here is a resource, one of millions on the web, is on this very website.
http://www.mathhelpforum.com/math-help/latex-help/
Surely if you do want help, it is no too much to ask you to cooperate.