Order of operations - what is 6÷2(1+2) ?

[robve]

IMHO, both 1 and 9 are correct because the formulation is ambiguous to begin with.

The only calculator that I know that disambiguates this sort of input is my Casio fx-CG50, among my collection. This exact problem is described in the User Guide version 3.40 in section 2-6 on page 52 fx-CG50 user guide

The expression

6÷2(1+2)

is changed to a form with parenthesis showing the explicit evaluation order of the implied multiplication:

6÷(2(1+2))

I like this feature of the Casio.

Apparently, no one reads calculator manuals any more ?

- Rob