To simplify this expression, we need to find a common denominator for all the fractions involved. The common denominator for 2007/2008, 1/2009, 2007/2008, 2009/2008, and 1/2008 is 2008.

So, the expression becomes:

(2007/2008 * 1/2009) + (2007/2008) : (2009/2008) + 1/2008

To add the fractions, we need to have the same denominator.

(2007/2008 * 1/2009) = (2007 * 1) / (2008 * 2009) = 2007 / 4029072

(2007/2008) : (2009/2008) = (2007/2008) * (2008/2009) = (2007 * 2008) / (2008 * 2009) = 2007 / 2009

Now, the expression becomes:

2007 / 4029072 + 2007 / 2009 + 1/2008

To add the fractions, we need to have the same denominator.

2007 / 4029072 + 2007 / 2009 + 1/2008 = (2007 * 2009) / (4029072 * 2009) + (2007 * 4029072) / (2009 * 4029072) + (1 * 4029072) / (2008 * 4029072)

= (4017463 / 8076148368) + (8058141895048 / 8076148368) + (4029072 / 8056146176)

= (8058141895048 + 4017463 + 4029072) / 8076148368

= 8058155943583 / 8076148368

Therefore, the simplified expression is 8058155943583 / 8076148368.