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"division and multiplication are the same level operations" thats not the question thats mandatory here.

As I said, 2(2+1) is not a mathematical correct expression. So theres space how to interpret this. The correct expression would be 2*(2+1), without the multiplication sign its only a common used simplification. So the calculator has to choose how the user meant it. If the user had used the correct expression both would be correct....

99% of the people wouldnt care about this, engineer disease :-) (me included)

TI inteprets this as 6/2*(2+1) and Casio as 6/(2*(2+1)) I think Casio is right beacause the user didnt acciedentally missed the * so the 2(2+1) is to see as one term like (2*(2+1).

Comments 5As I said, 2(2+1) is not a mathematical correct expression. So theres space how to interpret this. The correct expression would be 2*(2+1), without the multiplication sign its only a common used simplification. So the calculator has to choose how the user meant it. If the user had used the correct expression both would be correct....

99% of the people wouldnt care about this, engineer disease :-) (me included)

division and multiplication are the same level operations, so it goes as TI interpreted.

or if you had an F in math - then it's 1. ;)