1. The calculation result of the expression $67 \times 67-34 \times 34+67+34$ is
【Solution】Solve: $67 \times 67-34 \times 34+67+34$
$$
\begin{array}{l}
=67 \times(67+1)-34 \times 34+34 \\
=67 \times 2 \times 34-34 \times 34+34 \\
=101 \times 34 \\
=3434
\end{array}
$$

Therefore, the answer is: 3434.