6/2(2+1)

I think we've worn this one out.....

By the order of operations......multiplication and  division arre carried out at the same level of precedence......that is....we evalutate them from left to right as we encounter them....so...

6/2 (2 + 1) .......we encounter the division of 6/2, first  ...and this =  3

3 ( 2 + 1)      simplifying inside the parentheses

3 (3)  = 9

If your calculator evaluates the expression \(6/2(2+1)\) as 1, you need to use a different calculator.