What is the difference in use between 以及, 和 and 与?
There are a few differences between those three words:


"以及" can only connect phrases,not words.
The phrases after "以及" is commonly considered to secondary.
"与" and "和" are used to express the relationship. 
"与" is more elegant than "和". such as "老人与海".
"和" is mostly used in oral form.
In some cases,"和" and "与" are somewhat interchangeable, such as "我和他做事方法不同" or "我与他做事方法不同".