At 1, 2, 3 , 200620072008, add "+" or "-" arbitrarily before, and calculate in order. Can the sum of these numbers be equal to 2008?
Energy (- 1-2 + 3 + 4) + (- 5-6 + 7 + 8) + (- 9-10 + 11 + 12) - -2006+2007+2008,=4×502,=2008.
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