1. (10 points) Calculate: $(888+777) \div(666+555+444)=$
【Analysis】First extract the common factor 111, and then simplify the calculation according to the associative law of multiplication.
【Solution】Solution: $(888+777) \div(666+555+444)$
$$
\begin{array}{l}
=111 \times(8+7) \div[111 \times(6+5+4)] \\
=111 \times 15 \div 111 \div 15 \\
=(111 \div 111) \times(15 \div 15) \\
=1
\end{array}
$$

Therefore, the answer is: 1 .