2004³-2×2004²-2002/2004³+2004²-2005(2004³-2×2004²-2002)/(2004³+2004²-2005)
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2004³-2×2004²-2002/2004³+2004²-2005(2004³-2×2004²-2002)/(2004³+2004²-2005)
2004³-2×2004²-2002/2004³+2004²-2005
(2004³-2×2004²-2002)/(2004³+2004²-2005)
2004³-2×2004²-2002/2004³+2004²-2005(2004³-2×2004²-2002)/(2004³+2004²-2005)
(2004³-2×2004²-2002)/(2004³+2004²-2005)
=[2004²(2004-2)-2002]/[2004²(2004+1)-2005]
=(2004²×2002-2002)/(2004²×2005-2005)
=2002(2004²-1)/2005(2004²-1)
=2002/2005