ГДЗ по алгебре 8 класс Макарычев ФГОС Задание 1123

\[\boxed{\text{1123.\ }\text{еуроки}\text{-}\text{ответы}\text{\ }\text{на}\text{\ }\text{пятёрку}}\]

\[\textbf{а)}\ 0,6x² - 3,6x = 0\]

\[x^{2} - 6x = 0\]

\[x(x - 6) = 0\]

\[x_{1} = 0\ \ \ и\ \ \ x_{2} = 6.\]

\[Ответ:x = 0;x = 6.\]

\[\textbf{б)}\ c² - 5 = 0\]

\[c^{2} = 5\]

\[c_{1,2} = \pm \sqrt{5}.\]

\[Ответ:c = \pm \sqrt{5}.\]

\[\textbf{в)}\ 2x² + 17x = 0\]

\[x(2x + 17) = 0\]

\[x_{1} = 0;\]

\[2x_{2} + 17 = 0\]

\[2x_{2} = - 17\]

\[x_{2} = - 8,5.\]

\[Ответ:x = 0;x = - 8,5.\]

\[\textbf{г)}\ 0,5x² + 9 = 0\]

\[0,5x^{2} = - 9\]

\[x^{2} = - 18 \Longrightarrow корней\ нет.\]

\[Ответ:нет\ решений.\]