1. (8 points) The calculation result of the expression $(19 \times 19-12 \times 12) \div\left(\frac{19}{12}-\frac{12}{19}\right)$ is
【Solution】Solve: $(19 \times 19-12 \times 12) \div\left(\frac{19}{12}-\frac{12}{19}\right)$
$$
\begin{array}{l}
=(19 \times 19-12 \times 12) \div \frac{19 \times 19-12 \times 12}{12 \times 19} \\
=(19 \times 19-12 \times 12) \times \frac{12 \times 19}{19 \times 19-12 \times 12} \\
=12 \times 19 \\
=228
\end{array}
$$

Therefore, the answer is: 228.