yes, I have heard of them.
I see no property that is demonstrated. I do see some properties that can be used to simplify.
The question is like distributive, or associative or communitve have u ever heard of them before?
2 answers
This is basic rules. Here is a link:
http://www.stonewallcs.com/flashcards/content/Search_detail.php?id=82¬ecard=yes
http://www.stonewallcs.com/flashcards/content/Search_detail.php?id=82¬ecard=yes