Does 6/2 (1+2) equal 9 or 1

9, right?
PEMDAS:
1+2 =3

6/2 * 3= 9

I'm sorry, but I grew up with PEMDAS!
Please Excuse My Dear Aunt Sally
Parentheses, Exponents, Multipication AND Division, Addition AND Subtraction (They are interchangeable)

If you take this into account;
6/2(1+2)

Parentheses: 1+2 = 3
Exponents: Obvious there are none.
Multipication AND Division: 6 DIVIDED by 2 = 3
Now all you are left with is 3(3).
3 TIMES 3 is 9!

Tada! Not that hard. :)

I'd just like to point out that if you go to this website (http://www.mathsisfun.com/operation-order-pemdas.html), it clearly states that multiplication and division are in the same step, it just depends on which operation comes first, in this case, it's division, so
6/2(2+1)
6/2(3)
3(3)=9

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honestly anyone who says multiplication and division aren't interchangeable are dumb...thats common sense. the answer is 9 people!!!

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Mnemonics are often used to help students remember the rules, but the rules taught by the use of acronyms can be misleading. In the United States the acronym PEMDAS is common. It stands for Parentheses, Exponents, Multiplication, Division, Addition, Subtraction. If PEMDAS is followed without remembering to do multiplication and division at the same time and done instead with multplication then division students will get wrong answers. For example: 6÷2(1+2)=9 not 1. In other English speaking countries, Parentheses may be called Brackets, or symbols of inclusion and Exponentiation may be called either Indices, Powers or Orders, and since multiplication and division are of equal precedence, M and D are often interchanged, leading to such acronyms as BEDMAS, BIMDAS, BODMAS, BOMDAS, BERDMAS, PERDMAS, PEMDAS, and BPODMAS.