1. (10 points) Calculate: $28 \times 7 \times 25+12 \times 7 \times 25+7 \times 11 \times 3+44=$
【Analysis】According to the associative law and distributive law of multiplication, simplify and calculate. Pay attention to the multiplication of $11 \times 25$ using the trick "pull from both sides, add in the middle".

【Solution】Solve: $28 \times 7 \times 25+12 \times 7 \times 25+7 \times 11 \times 3+44$
$$
\begin{array}{l}
=7 \times 25 \times(28+12)+11 \times 21+11 \times 4 \\
=7 \times(25 \times 40)+11 \times(21+4) \\
=7 \times 1000+11 \times 25 \\
=7000+275 \\
=7275
\end{array}
$$

Therefore, the answer is: 7275.