\[Стр.\ 58.\]
\[\boxed{\mathbf{6.}}\]
\[\textbf{а)}\ x\ :5 = - 7\]
\[x = - 7 \cdot 5\]
\[x = - 35\]
\[Ответ:\ - 35.\]
\[\textbf{б)}\ \ y \cdot ( - 7) = 56\]
\[y = 56\ :( - 7)\]
\[y = - 8\]
\[Ответ:\ - 8.\]
\[\textbf{в)}\ a - 4 = - 11\]
\[a = - 11 + 4\]
\[a = - 7\]
\[Ответ:\ - 7.\]
\[\textbf{г)} - 7b = - 14\]
\[b = - 14\ :( - 7)\]
\[b = 2\]
\[Ответ:\ 2\]
\[\boxed{\mathbf{7.}}\]
\[a\] | \[26\] | \[- 2\] | \[14\] | \[- 40\] | \[- 1\] | \[- \frac{1}{2}\] | \[- \frac{3}{5}\] | \[- \frac{6}{7}\] | \[1,2\] | \[- 1,4\] |
---|---|---|---|---|---|---|---|---|---|---|
\[b\] | \[5\] | \[1\] | \[- 2\] | \[- 20\] | \[- 1\] | \[\frac{1}{4}\] | \[- \frac{15}{4}\] | \[\frac{3}{5}\] | \[- 0,6\] | \[- 0,7\] |
a+b | \[31\] | \[- 1\] | \[12\] | \[- 60\] | \[- 2\] | \[- \frac{1}{4}\] | \[\frac{4}{25}\] | \[- 4\frac{7}{20}\] | \[0,6\] | \[- 2,1\] |
\[- \frac{3}{5} - \frac{15}{4} = - \frac{12}{20} - \frac{75}{20} = - \frac{87}{20} =\]
\[= - 4\frac{7}{20}\]