2004/2005²—2006*2004

问题描述:

2004/2005²—2006*2004

2004/(2005²-2006×2004)
=2004/[2005²-(2005+1)(2005-1)]
=2004/[2005²-(2005²-1)]
=2004/(2005²-2005²+1)
=2004/1
=2004