题目应该是:2000+4000×1999+1999²×2000/2002^2-4×2002+4
=2000(1+2*1999+1999^2)/(2002-2)^2
=2000*(1+1999)^2/2000^2
=2000^3/2000^2
=2000
题目应该是:2000+4000×1999+1999²×2000/2002^2-4×2002+4
=2000(1+2*1999+1999^2)/(2002-2)^2
=2000*(1+1999)^2/2000^2
=2000^3/2000^2
=2000