\[\boxed{\mathbf{Страница\ 79.\ }\mathbf{Еуроки\ - \ ДЗ\ без\ мороки}}\]
\[\boxed{\mathbf{14.\ }}\]
\[\textbf{а)}\ 800\ :25 = 32 \cdot 20 =\]
\[= 640 - 410 = 230\ :10 =\]
\[= 23 \cdot 5 = 115\]
\[Ответ:115.\]
\[\textbf{б)}\ 441 + 209 = 650 - 160 =\]
\[= 490\ :7 = 70 \cdot 5 = 350\ :35 =\]
\[= 10 \cdot 7 = 70\]
\[Ответ:70.\]
\[\textbf{в)}\ 47\ 000 + 29\ 000 =\]
\[= 76\ 000\ :1900 = 40 \cdot 25 =\]
\[= 1000 - 999 = 1\]
\[Ответ:1.\]
\[\textbf{г)}\ 40\ 000 - 22\ 900 =\]
\[= 17\ 100:900 = 19 \cdot 140 =\]
\[= 2660 + 520 = 3180\]
\[Ответ:3180.\]
\[\textbf{д)}\ 96\ 000\ :3200 = 30 \cdot 27 =\]
\[= 810 + 90 = 900\ :6 = 150\]
\[Ответ:150.\]
\[\textbf{е)}\ 15\ 000\ :6 = 2500 \cdot 4 =\]
\[= 10\ 000\ :5 = 2000 \cdot 7 =\]
\[= 14\ 000\]
\[Ответ:14\ 000.\]