2. Calculate $\left(\frac{1}{30}+\frac{1}{35}+\frac{1}{63}\right) \times 2 \frac{1}{7}=$ ?
2. $\frac{1}{6}$
2. 【Solution】Original expression $=\left(\frac{1}{2 \times 3 \times 5}+\frac{1}{5 \times 7}+\frac{1}{3 \times 3 \times 7}\right) \times \frac{15}{7}$
$$
\begin{array}{l}
=\frac{21+18+10}{2 \times 3 \times 3 \times 5 \times 7} \times \frac{15}{7} \\
=\frac{49}{2 \times 3 \times 7 \times 7}
\end{array}
$$
$$
=\frac{1}{6}
$$