1. (3 points) Calculate: $\left[2 \frac{3}{5}-\left(8.5-2 \frac{2}{3}\right) \div 3.5\right] \times 7 \frac{1}{2}=$
1. (3 points) Calculate: $\left[2 \frac{3}{5}-\left(8.5-2 \frac{2}{3}\right) \div 3.5\right] \times 7 \frac{1}{2}=7$.
【Solution】Solution: $\left[2 \frac{3}{5}-\left(8.5-2 \frac{2}{3}\right) \div 3.5\right] \times 7 \frac{1}{2}=$
$$
\begin{array}{l}
=\left[\frac{13}{5}-\left(\frac{17}{2}-\frac{8}{3}\right) \div \frac{7}{2}\right] \times \frac{15}{2} \\
=\left[\frac{13}{5}-\frac{35}{6} \times \frac{2}{7}\right] \times \frac{15}{2} \\
=\left[\frac{13}{5}-\frac{5}{3}\right] \times \frac{15}{2} \\
=\frac{13}{5} \times \frac{15}{2}-\frac{5}{3} \times \frac{15}{2} \\
=\frac{39}{2}-\frac{25}{2} \\
=7 .
\end{array}
$$