\[Страница\ 24.\]
\[\boxed{\mathbf{8.}}\]
\[60\ :4 + 72\ :8 = 15 + 9 = 24\]
\[Ответ:24.\]
\[\boxed{\mathbf{9.}}\]
\[96\ :8 \cdot 7 - 84\ :4 \cdot 3 =\]
\[= 84 - 63 = 21\]
\[Ответ:21.\]
\[\boxed{\mathbf{10.}}\]
\[a\] | \[9\] | \[100\] | \[7\] | \[1\] | \[5\] |
---|---|---|---|---|---|
\[b\] | \[8\] | \[10\] | \[3\] | \[0\] | \[5\] |
\[3a + 4b\] | \[59\] | \[340\] | \[33\] | \[3\] | \[35\] |
\[12a - 7b\] | \[52\] | \[1130\] | \[63\] | \[12\] | \[25\] |
\[\boxed{\mathbf{11.}}\]
\[\textbf{а)}\ 96\ 000\ :3200 = 30 \cdot 27 =\]
\[= 810 + 90 = 900\ :6 = 150\]
\[\textbf{б)}\ 19\ 000 + 11\ 000 =\]
\[= 30\ 000\ :600 = 50 \cdot 19 =\]
\[= 950 + 50 = 1000\]
\[\textbf{в)}\ 1000 - 550 = 450\ :9 =\]
\[= 50\ :2 = 25 \cdot 3 = 75\]
\[\boxed{\mathbf{12.}}\]
\[\textbf{а)}\ 9\ м\ :14 = \frac{9}{14}\ (м) - ткани\ \]
\[пошло\ на\ одно\ полотенце.\]
\[Ответ:\ \frac{9}{14}\ м.\]
\[\textbf{б)}\ \ 7\ :13 = \frac{7}{13}\ (кг) - варенья\ \]
\[в\ одной\ банке.\]
\[Ответ:\ \frac{7}{13}\ кг.\]
\[\textbf{в)}\ 11\ :7 = \frac{11}{7}\ (кг) - меда\ в\ \]
\[большой\ банке.\]
\[6\ :7 = \frac{6}{7}\ (кг) - меда\ в\ \]
\[маленькой\ банке.\]
\[\frac{11}{7} - \frac{6}{7} = \frac{5}{7}\ (кг) - меда\ больше\ \]
\[в\ большой\ банке,\ чем\ в\ \]
\[маленькой.\]
\[Ответ:\ \ на\ \frac{5}{7}\ кг\ больше.\]
\[\textbf{г)}\ 90\ :12 - 78\ :12 =\]
\[= \frac{90}{12} - \frac{78}{12} = \frac{12}{12} = 1\ \left( \frac{м}{с} \right) -\]
\[скорость\ Максима\ больше\ \]
\[скорости\ Вани.\]
\[Ответ:на\ 1\ \frac{м}{с}.\]