I. Fill-in-the-Blank Questions I (8 points each, total 40 points)
1. (8 points) Calculate: $1 \times 15+2 \times 14+3 \times 13+4 \times 12+5 \times 11+6 \times 10+7 \times 9+8 \times 8=$ $\qquad$
【Solution】Solution: $1 \times 15+2 \times 14+3 \times 13+4 \times 12+5 \times 11+6 \times 10+7 \times 9+8 \times 8$
$$
\begin{array}{l}
=15+28+39+48+55+60+63+64 \\
=372
\end{array}
$$

Therefore, the answer is: 372.