(2005³-2*2005²-2003)/(2005³-2005²-2006)

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(2005³-2*2005²-2003)/(2005³-2005²-2006)(2005³-2*2005²-2003)/(2005³

(2005³-2*2005²-2003)/(2005³-2005²-2006)
(2005³-2*2005²-2003)/(2005³-2005²-2006)

(2005³-2*2005²-2003)/(2005³-2005²-2006)
题目(2005³-2*2005²-2003)/(2005³-2005²-2006)
是不是应该改为(2005³-2*2005²-2003)/(2005³+2005²-2006)
(2005³-2*2005²-2003)/(2005³+2005²-2006)
=[2005²(2005-2)-2003]/[2005²(2005+1)-2006]
=[2005²*2003-2003]/[2005²*2006-2006]
=[(2005²-1)*2003]/[(2005²-1)*2006]
=2003/2006