[ml/nj]

They virtually give you the answer.

12 + 34 x 56 + 78 + 9 = 2003
-78 +89 = +11
+7 -9 = -2

so
12 + 34 x 56 + 7 +89 = 2012

ML/NJ

[oh8eleven]

They virtually give you the answer.
Ah, but not if you read the question properly, grasshopper ... "The object is to use just three of the following arithmetic operations ...