\[\boxed{\mathbf{Стр.\ 58.\ }еуроки - ответы\ на\ пятёрку}\]
\[\boxed{\mathbf{9.}}\]
\[1)\ 55 \cdot 5 = 575\ км.\]
\[2)\ 340\ :2 = 170\ \frac{км}{ч}.\]
\[3)\ 12 \cdot (12\ :3) = 12 \cdot 4 = 48\ м^{2}.\]
\[4)\ 9 \cdot 7 = 63\ м^{2}.\]
\[\boxed{\mathbf{10.}}\]
\[1581 \cdot 7 < 12\ 067\]
\[7384 \cdot 5 < 40\ 920\]
\[257 \cdot 40 > 10\ 280\]
\[485 \cdot 50 > 24\ 000\]
\[\boxed{\mathbf{11.}}\]
\[4\ ц\ :8 = 400\ кг\ :8 = 50\ кг\]
\[9\ м\ :45 = 900\ см\ :45 = 20\ см\]
\[5\ см^{2}\ :25 = 500\ мм^{2}\ :25 =\]
\[= 20\ мм^{2}\]
\[3\ нед.\ \ :7 = 21\ сут.\ \ :7 = 3\ сут.\]
\[2\ века\ :40 = 200\ лет\ \ :40 =\]
\[= 5\ лет = 60\ мес.\]
\[7\ м^{2}\ :350 = 70\ 000\ см^{2}\ :350 =\]
\[= 200\ см^{2}\]
\[\boxed{\mathbf{12.}}\]