\[\boxed{\text{Страница}\text{\ 7.}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[15.\]
\[120 \cdot 30 = 3600\]
\[120 \cdot 300 = 36\ 000\]
\[1200 \cdot 300 = 360\ 000\]
\[12\ 000 \cdot 300 = 3\ 600\ 000\]
\[40 \cdot 600 = 24\ 000\]
\[900 \cdot 80 = 72\ 000\]
\[500 \cdot 500 = 250\ 000\]
\[2 \cdot 600 = 1200\]
\[16.\]
\[17.\]
\[\text{x\ }:321 = 106\]
\[x = 106 \cdot 321\]
\[x = 34\ 026.\]
\[\text{y\ }:467 = 2085\]
\[y = 2085 \cdot 467\]
\[y = 973\ 695.\]