1. (6 points) Calculate: $30 \% \div 1 \frac{2}{5} \times\left(\frac{1}{3}+\frac{1}{7}\right)=$
1. (6 points) Calculate: $30 \% \div 1 \frac{2}{5} \times\left(\frac{1}{3}+\frac{1}{7}\right)=-\frac{5}{49}$.
【Solution】Solution:
$$
\begin{array}{l}
30 \% \div 1 \frac{2}{5} \times\left(\frac{1}{3}+\frac{1}{7}\right), \\
=30 \% \div 1 \frac{2}{5} \times \frac{10}{21}, \\
=\frac{3}{14} \times \frac{10}{21}, \\
=\frac{5}{49} .
\end{array}
$$

Therefore, the answer is: $\frac{5}{49}$.