\(\dfrac{2001.2002+1981+2003.21}{2002.2003-2001.2002}\)
\(=\dfrac{2001.2002+1981+\left(2002+1\right).21}{2002.\left(2003-2001\right)}\)
\(=\dfrac{2001.2002+1981+21+2002.21}{2002.2}\)
\(=\dfrac{2001.2002+2002+2002.21}{2002.2}\)
\(=\dfrac{2002\left(2001+1+21\right)}{2002.2}=\dfrac{2023}{2}\)