\[\boxed{\mathbf{1.}}\]
\[\textbf{а)}\ V = a \cdot b \cdot c\]
\[\textbf{б)}\ P = (a + b) \cdot 2\]
\[\textbf{в)}\ a = b \cdot c + r\]
\[\textbf{г)}\ S = a \cdot b\ \]
\[\boxed{\mathbf{2.}}\]
\[a\] | \[38\] | \[100\] | \[61\] |
---|---|---|---|
\[b\] | \[9\] | \[15\] | \[13\] |
\[c\] | \[4\] | \[6\] | \[4\] |
\[r\] | \[2\] | \[10\] | \[9\] |
\[\boxed{\mathbf{3.}}\]
\[\textbf{а)}\ 230\ :50 = 4\ (ост.\ 30)\]
\[\textbf{б)}\ 470\ :90 = 5\ (ост.\ 20)\]
\[5 \cdot 90 + 20 = 450 + 20 = 470.\]
\[5800\ :600 = 9\ (ост.\ 400)\]
\[9 \cdot 600 + 400 = 5400 + 400 =\]
\[= 5800\]
\[\boxed{\mathbf{4.}}\]
\[\textbf{а)}\ 30\ 855\ 000 - 7\ 375\ 438\]
\[Проверка:\]
\[\textbf{б)}\ 18\ 048\ 000\ :600 =\]
\[= 180\ 480\ :6\]
\[Проверка:\]
\[\boxed{\mathbf{5.}}\]
\[1)\ 3 \cdot 3 \cdot 3 = 27\ \left( м^{3} \right) - объем\ \]
\[комнаты.\]
\[2)\ 4 \cdot 3 \cdot 3 = 36\ \left( м^{2} \right) - площадь\ \]
\[стен.\]
\[3)\ 36 \cdot 200 = 7200\ г =\]
\[= 7\ кг\ 200\ г - краски\ \]
\[потребуется.\]
\[Ответ:27\ м^{3};\ 7\ кг\ 200\ г.\]
Часть 3 учебника.