1. Calculate: $57.6 \times \frac{8}{5}+28.8 \times \frac{184}{5}-14.4 \times 80+12 \frac{1}{2}=$
【Answer】 $12 \frac{1}{2}$
【Explanation】
$$
\begin{aligned}
\text { Original expression } & =57.6 \times \frac{8}{5}+28.8 \times \frac{184}{5}-14.4 \times 80+12 \frac{1}{2} \\
& =28.8 \times \frac{16}{5}+28.8 \times \frac{184}{5}-14.4 \times 80+12 \frac{1}{2} \\
& =28.8 \times \frac{200}{5}-14.4 \times 80+12 \frac{1}{2} \\
& =28.8 \times 40-14.4 \times 2 \times 40+12 \frac{1}{2} \\
& =12 \frac{1}{2}
\end{aligned}
$$