(2004/2005)²-1/2005²

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(2004/2005)²-1/2005²
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(2004/2005)²-1/2005²
(2004/2005)²-1/2005²

(2004/2005)²-1/2005²
(2004/2005)^2-1/2005^2
=(2004/2005+1/2005)(2004/2005-1/2005)
=1x2003/2005
=2003/2005