While I don't see it in the documentation, I would expect QlikView to implement the "standard" order of operations. In other words (and I'm sure I'm missing some, and might have something wrong):
terms inside parentheses
multiplication and division
addition and subtraction
comparisons
not
and
or
assignment
left to right
This should also answer your question about parentheses. Yes, you can override with parentheses because they come first in the order of operations.
But why even ask when you can so easily test? Type some expressions in and see what happens.
I think, one of the big purposes of a community is to document the stuff not documented, so thousands of people don't all have to waste time testing to trial and error how something works
