Is there a rule in mathematics that states that expressions shall be evaluated from left to right assuming that all operators in the expression share the same precedence?
e.g. given the expression
6 / 2 * (1 + 2)
is there a rule so that only
(6 / 2) * (1 + 2) (result: 9) is a valid representation and
6 / (2 * (1 + 2)) (result: 1) is invalid?
edit: I am asking this, because I get different results on different calculators.