\[\boxed{\mathbf{Страница\ 61.\ }\mathbf{Еуроки\ - \ ДЗ\ без\ мороки}}\]
\[\mathbf{2.}\]
\[a\] | \[b\] | \[S\] | \[P\] |
---|---|---|---|
\[15\ см\] | \[5\ см\] | \[75\ см²\] | \[40\ см\] |
\[21\ м\] | \[7\ м\] | \[147\ м²\] | \[56\ дм\] |
\[12\ дм\] | \[6\ дм\] | \[72\ дм²\] | \[36\ дм\] |
\[S = a \cdot b\]
\[P = 2 \cdot (a + b)\]
\[\mathbf{3.}\]
\[a = 10\ м;\ \ b = 8\ м;\ \ c = 4\ м:\]
\[S = a \cdot b = 10 \cdot 8 = 80\ \left( м^{2} \right) -\]
\[площадь\ дна\ бассейна.\]
\[V = S \cdot c = 80 \cdot 4 = 320\ \left( м^{3} \right) -\]
\[объем\ бассейна.\]
\[\boxed{\mathbf{3.\ }}\]
\[\textbf{а)}\ 44\ :5 = 8\ (ост.\ 4)\]
\[Проверка:\]
\[5 \cdot 8 + 4 = 44\]
\[\textbf{б)}\ 83\ :15 = 5\ (ост.\ 8)\]
\[Проверка:\ \ \ \]
\[15 \cdot 5 + 8 = 83\]
\[\textbf{в)}\ 72\ 188\ :8 = 9023\ (ост.\ 4)\]
\[Проверка:\ \ \]
\[8 \cdot 9023 + 4 = 72\ 184 + 4 =\]
\[= 72\ 188\]
\[\textbf{г)}\ 604\ 200\ :700 = 6042\ :7 =\]
\[= 863\ (ост.\ 100)\]
\[Проверка:\ \ \]
\[700 \cdot 863 + 100 = 604\ 200\]
\[\boxed{\mathbf{4.\ }}\]
\[V = 343\ \left( м^{3} \right).\]
\[V = 7 \cdot 7 \cdot 7\]
\[V = (7 - 2) \cdot (7 + 2) \cdot 7 =\]
\[= 5 \cdot 9 \cdot 7 = 5 \cdot 63 = 315\ \left( м^{3} \right).\]
\[Объем\ уменьшился\ на:\]
\[343 - 315 = 28\ \left( м^{3} \right).\]
\[\mathbf{Урок\ 41.\ Формула\ деления\ с\ остатком}\]