\[\boxed{\mathbf{Вариант\ 1.}}\]
\[\boxed{\mathbf{1.}}\]
\[Ответ:число\ 9\ 009.\]
\[\boxed{\mathbf{2.}}\]
\[Ответ:89\ 035.\]
\[\boxed{\mathbf{3.}}\]
\[16\ т\ 80\ кг = 16\ 080\ кг.\]
\[\boxed{\mathbf{4.}}\]
\[120\ :(30 \cdot 2) = 120\ :30\ :2\]
\[Ответ:120\ :30\ :2.\]
\[\boxed{\mathbf{5.}}\]
\[P = 4a.\]
\[20\ :4 = 5\ (см) - сторона\ \]
\[квадрата.\]
\[Ответ:5\ см.\]
\[\boxed{\mathbf{6.}}\]
\[Ответ:\ (7000 - 900)\ :2.\]
\[\boxed{\mathbf{7.}}\]