Решебник по алгебре 8 класс Мерзляк ФГОС Задание 858

\[\boxed{\mathbf{858\ (858).\ }Еуроки\ - \ ДЗ\ без\ мороки}\]

\[\frac{a + b + c}{a + b - c} = \frac{a - b + c}{a - b - c}\]

\[(a + b + c)(a - b - c) =\]

\[= (a + b - c)(a - b + c)\]

\[- 2c(a + b) + 2c(a - b) = 0\]

\[c( - a - b + a - b) = 0\]

\[- 2cb = 0\]

\[cb = 0\]

\[c = 0\ \ или\ \ \ \ b = 0.\]

\[\boxed{\mathbf{8}\mathbf{5}\mathbf{8}\mathbf{\text{.\ }}Еуроки\ - \ ДЗ\ без\ мороки}\]

\[y = \frac{k}{x},\ \ A\ \left( - \sqrt{12};\sqrt{3} \right)\]

\[k = xy\]

\[k = - \sqrt{12} \cdot \sqrt{3} = - \sqrt{36} = - 6\]

\[y = - \frac{6}{x}\]