1. (6 points) Calculate: $(7777+8888) \div 5-(888-777) \times 3=$
【Analysis】Decompose $7777+8888$ and $888-777$ into the product of two numbers, and then calculate according to the distributive law of multiplication.

【Solution】Solution: $(1111 \times 7+1111 \times 8) \div 5-(111 \times 8-111 \times 7) \times 3$,
$$
\begin{array}{l}
=1111 \times(7+8) \div 5-111 \times(8-7) \times 3, \\
=1111 \times(15 \div 5)-111 \times 1 \times 3, \\
=1111 \times 3-111 \times 3, \\
=(1111-111) \times 3, \\
=1000 \times 3, \\
=3000 .
\end{array}
$$

Therefore, the answer is: 3000.