Решебник по математике 6 класс Виленкин Часть 1, 2 Часть 2. Параграф 4. Действия с рациональными числами Задание 334

\[\boxed{\text{4.\ 334}}\]

\[\textbf{а)} - 7,42z = 70,49\]

\[z = 70,49\ :( - 7,42)\]

\[z = - 7049\ :742\]

\[z = - 9,5.\]

\[\textbf{б)}\ z\ :( - 4,04) = - 8,5\]

\[z = 8,05 \cdot 4,04\]

\[z = 32,522.\]

\[\textbf{в)}\ 9,43 \cdot ( - c) = 22,632\]

\[- c = 22,632\ :9,43\]

\[- c = 22\ 632\ :9430\]

\[- c = 2,4\]

\[c = - 2,4.\]

\[\textbf{г)}\ - \frac{4}{7}c = \frac{9}{14}\]

\[- c = \frac{9}{14}\ :\frac{4}{7} = \frac{9}{14} \cdot \frac{7}{4}\]

\[- c = \frac{63}{56} = \frac{9}{8}\]

\[c = - 1\frac{1}{8}.\]

\[\textbf{д)} - 3,7 \cdot ( - n) = - 0,37\]

\[- n = - 0,37\ :( - 3,7)\]

\[- n = 0,1\]

\[n = - 0,1.\]

\[\textbf{е)}\ \frac{7}{9}n = - 0,63\]

\[n = - 0,63\ :\frac{7}{9} = - 0,63 \cdot \frac{9}{7}\]

\[n = - 0,09 \cdot 9\]

\[n = - 0,81.\]