\[\boxed{\text{178.}}\]
\[300 - 200 = 100\]
\[227 + 3 = 230\]
\[585 - 485 = 100\]
\[400 - 330 = 70\]
\[550 - 350 = 200\]
\[100 + 230 + 100 + 70 + 200 =\]
\[= 700\ ц.\]
\[Ответ:поезд\ везет\ 700\ ц\ груза.\]
\[\boxed{\text{179.}}\]
\[1)\ 470 + 45 = 515\ (г) - вес\ \ \]
\[второго\ медвежонка.\]
\[2)\ 470 + 515 = 985\ (г) - весят\ \]
\[оба\ медвежонка.\]
\[Ответ:985\ грамм.\]
\[\boxed{\text{180.}}\]
\[\boxed{\text{181.}}\]
\[1)\ 170 + 260 = 430\]
\[2)\ 380 + 450 = 830\]
\[1)\ 450 + 380 = 830\]
\[2)\ 140 + 180 = 320\]