1+1/2×3+1/3×4+1/4×5+……+1/2001×2002+1/2002×2003=?急求答案！

1+1/2×3+1/3×4+1/4×5+……+1/2001×2002+1/2002×2003=1+(2003+3)×2001/2+(1/2+1/2002)×2001/2=2007504  1501/2002