\[\boxed{\text{Вопрос}\text{\ }\text{на}\text{\ }\text{стр}\text{.\ 43}}\]
\[49\ 210\ :70 = 4921\ :7 = 703\]
\[980 \cdot 400 = 392\ 000\]
\[558\ 720\ :9 \cdot 5 - 6140\ :20 =\]
\[= 310\ 400 - 307 = 310\ 093\]
\[6140\ :20 = 614\ :2 = 307\]