1. (8 points) Calculate $82-38+49-51=$ $\qquad$
1. (8 points) Calculate $82-38+49-51=42$.
【Solution】Solution: $82-38+49-51$
$$
\begin{array}{l}
=(80+2)-(40-2)+(50-1)-(50+1) \\
=80+2-40+2+50-1-50-1 \\
=(80-40+50-50)+(2+2-1-1) \\
=40+2 \\
=42
\end{array}
$$

Therefore, the answer is: 42.