1. (6 points) Calculate: $121 \times \frac{13}{25}+12 \times \frac{21}{25}$.
【Solution】Solve: $121 \times \frac{13}{25}+12 \times \frac{21}{25}$
$$
\begin{array}{l}
=(100+21) \times \frac{13}{25}+12 \times \frac{21}{25} \\
=100 \times \frac{13}{25}+21 \times \frac{13}{25}+12 \times \frac{21}{25} \\
=52+13 \times \frac{21}{25}+12 \times \frac{21}{25} \\
=52+(13+12) \times \frac{21}{25} \\
=52+25 \times \frac{21}{25} \\
=52+21 \\
=73 .
\end{array}
$$