§ Задание 57
\[\boxed{\text{6.57.}}\]
\[\textbf{а)}\ 7\ 031 = 7\ 000 + 30 + 1.\ \]
\[\textbf{б)}\ 13\ 781\ 903 =\]

\[\textbf{в)}\ 9\ 000 = 9 \cdot 1\ 000.\ \]

\[\boxed{\text{6.57.}}\]
\[\textbf{а)}\ 7\ 031 = 7\ 000 + 30 + 1.\ \]
\[\textbf{б)}\ 13\ 781\ 903 =\]

\[\textbf{в)}\ 9\ 000 = 9 \cdot 1\ 000.\ \]
