\[\boxed{\mathbf{451.ОК\ ГДЗ - домашка\ на}\ 5}\]
\[\textbf{а)}\ 1\ см^{2} = 100\ мм^{2}:\]
\[S = 24\ см^{2} = 24 \bullet 100 =\]
\[= 2400\ мм^{2}.\]
\[\textbf{б)}\ 1\ см^{2} = 0,01\ дм^{2}:\]
\[S = 24\ см^{2} = 24\ :100 =\]
\[= 0,24\ дм^{2}.\]