ГДЗ по алгебре 7 класс Макарычев Задание 662

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\[\textbf{а)}\ 5x^{2} + 3x = 0\]

\[x(5x + 3) = 0\]

\[x = 0\ \ или\ \ 5x + 3 = 0\]

\[\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ x = - \frac{3}{5} = - 0,6\]

\[Ответ:x = 0;\ \ x = - 0,6.\]

\[\textbf{б)}\ x^{2} - 11x = 0\]

\[x(x - 11) = 0\]

\[x = 0\ \ \ \ \ \ \ или\ \ \ x = 11\]

\[Ответ:x = 0;\ \ x = 11.\]

\[\textbf{в)}\ 6x^{2} - 3,6x = 0\]

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

\[x = 0\ \ \ \ или\ \ \ \ x = 0,6\]

\[Ответ:x = 0;\ \ x = 0,6.\]

\[\textbf{г)}\ 0,3x^{2} - 3x = 0\]

\[3x(0,1x - 1) = 0\]

\[x = 0\ \ или\ \ \ \ 0,1x = 1\]

\[\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ x = 10\]

\[Ответ:x = 0;\ \ x = 10.\]

\[\textbf{д)}\ 5x^{2} - 0,8x = 0\]

\[x(5x - 0,8) = 0\]

\[x = 0\ \ или\ \ \ \ 5x = 0,8\]

\[\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ x = 0,16\]

\[Ответ:x = 0;\ \ x = 0,16.\]

\[\textbf{е)}\ 7x^{2} - 0,28x = 0\]

\[7x(x - 0,04) = 0\]

\[x = 0\ \ \ \ или\ \ \ \ x = 0,04\]

\[Ответ:x = 0;\ \ x = 0,04.\]