2. (7 points) Calculate: $\frac{145}{273} \times 2 \frac{173}{245} \div 21 \frac{13}{15}=$
$$
\begin{array}{l}
\text { [Solution] Solution: } \frac{145}{273} \times 2 \frac{173}{245} \div 21 \frac{13}{15} \\
=\frac{145}{273} \times \frac{663}{245} \times \frac{15}{328} \\
=\frac{7395}{112504} ;
\end{array}
$$

Therefore, the answer is: $\frac{7395}{112504}$.