\[\boxed{\mathbf{Проверочная\ работа.\ \ Единицы\ измерения\ площадей}}\]
\[\boxed{\mathbf{1.}}\]
\[18\ а = 1800\ м^{2}.\]
\[\boxed{\mathbf{2.}}\]
\[20\ 000\ дм^{2} = 200\ м^{2}.\]
\[\boxed{\mathbf{3.}}\]
\[12\ км^{2} = 12\ 000\ 000\ м^{2} =\]
\[= 1200\ га.\]
\[\boxed{\mathbf{4.}}\]
\[3000\ а = 30\ га.\]
\[\boxed{\mathbf{5.}}\]
\[6000\ м^{2} = 60\ соток.\]
\[Да.\]
\[\boxed{\mathbf{6.}}\]
\[130 \cdot 90 = 11\ 700\ м^{2}.\]
\[1\ га = 10\ 000\ м^{2}.\]
\[Да.\]
\[\boxed{\mathbf{7.}}\]
\[1\ га = 100\ а\]
\[Нет.\]
\[\boxed{\mathbf{8.}}\]
\[9 \cdot 9 = 81\ м^{2}.\]
\[1\ а = 100\ м^{2}.\]
\[Да.\]