The answer shown in ImageShack is wrong
In this equation, priority is given to the operation 2(1+2) before 6÷2.
So, the right answer should be 1.
Sorry but recall the order of operations:
3. Multiplication/Division which ever occurs first from left to right
4. Addition/Subtraction which ever occurs first from left to right.
so you start by adding (1+2)
and it turns into 6÷2(3).
But then as all that is left is multiplication or division, we look from left to right and 6÷2 goes first turning it into 3 times 3, or 9.
I should say rarely would someone in real life write a problem like that, and problems of that nature are supposed to be intentionally misleading.