$\frac{2181.729+243.81.27}{3².9².234+18.54.162.9+723.729}$
= $\frac{2181.729+243.3.81.9}{9.81.234+18.54.2.81.9+723.729}$
= $\frac{2181.729+729.729}{729.234+1994.729+723.729}$
= $\frac{729.(2181+729)}{729.(234+1944+723)}$
= $\frac{729.2910}{729.2901}$
= $\frac{2910}{2901}$
= $\frac{970}{967}$