\[\boxed{\text{170\ (170).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[\mathbf{1\ к}\mathbf{м}^{\mathbf{2}}\mathbf{= 1\ 000\ 000\ }\mathbf{м}^{\mathbf{2}}\mathbf{.}\]
\[\mathbf{1\ }\mathbf{м}^{\mathbf{2}}\mathbf{= 100\ }\mathbf{д}\mathbf{м}^{\mathbf{2}}\]
\[\mathbf{1\ }\mathbf{м}^{\mathbf{2}}\mathbf{= 10\ 000\ }\mathbf{с}\mathbf{м}^{\mathbf{2}}\]
\[\mathbf{1\ }\mathbf{д}\mathbf{м}^{\mathbf{2}}\mathbf{=}\mathbf{100\ с}\mathbf{м}^{\mathbf{2}}\]
\[\mathbf{1\ с}\mathbf{м}^{\mathbf{2}}\mathbf{= 100\ }\mathbf{м}\mathbf{м}^{\mathbf{2}}\]
Решение.
\[1)\ 5\ {км}^{2} = 5\ 000\ 000\ м^{2}\]
\[500\ {дм}^{2} = 5\ м^{2}\]
\[2)\ 8\ {см}^{2} = 800\ {мм}^{2}\]
\[3\ {см}^{2}\ 20\ {мм}^{2} = 320\ {мм}^{2}\]
\[3)\ 2\ {дм}^{2} = 200\ {см}^{2}\]
\[3\ м^{2} = 30\ 000\ {см}^{2}\]
\[4)\ 7\ м^{2} = 700\ {дм}^{2}\]
\[900\ {см}^{2} = 9\ {дм}^{2}\]