\[\boxed{\text{15\ (15).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
Пояснение.
Решение.
\[\textbf{а)}\ \frac{y - 5}{8} = 0\]
\[y - 5 = 0\]
\[y = 5\]
\[Ответ:при\ y = 5.\]
\[\textbf{б)}\ \frac{2y + 3}{10} = 0\]
\[2y + 3 = 0\]
\[2y = - 3\]
\[y = - \frac{3}{2}\]
\[Ответ:при\ y = - 1,5.\]
\[\textbf{в)}\ \frac{x \cdot (x - 1)}{x + 4} = 0\]
\[x \cdot (x - 1) = 0\]
\[x = 0;\ \ \ x - 1 = 0\]
\[\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ x = 1.\]
\[Допустимые\ значения:\]
\[x + 4 = 0\]
\[x = - 4.\]
\[Все\ числа,\ кроме\ x = - 4.\]
\[Ответ:при\ x = 0;x = 1.\]
\[\textbf{г)}\ \frac{x \cdot (x + 3)}{2x + 6} = 0\]
\[x(x + 3) = 0\]
\[x = 0;\ \ \ \ x + 3 = 0\]
\[\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ x = - 3.\]
\[Допустимые\ значения:\]
\[2x + 6 = 0\]
\[2x = - 6\]
\[x = - 6\ :2\]
\[x = - 3.\]
\[Все\ числа,\ кроме\ x = - 3.\]
\[То\ есть\ x = - 3\ не\ подходит.\]
\[Ответ:при\ x = 0.\]
\[\boxed{\text{15\ .\ }\text{еуроки}\text{-}\text{ответы}\text{\ }\text{на}\text{\ }\text{пятёрку}}\]
Пояснение.
Решение.
\[\textbf{а)}\ \frac{y - 5}{8} = 0\]
\[y - 5 = 0\]
\[y = 5\]
\[Ответ:при\ y = 5.\]
\[\textbf{б)}\ \frac{2y + 3}{10} = 0\]
\[2y + 3 = 0\]
\[2y = - 3\]
\[y = - \frac{3}{2}\]
\[Ответ:при\ y = - 1,5.\]
\[\textbf{в)}\ \frac{x \cdot (x - 1)}{x + 4} = 0\]
\[x \cdot (x - 1) = 0\]
\[x = 0;\ \ \ x - 1 = 0\]
\[\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ x = 1.\]
\[Допустимые\ значения:\]
\[x + 4 = 0\]
\[x = - 4.\]
\[Все\ числа,\ кроме\ x = - 4.\]
\[Ответ:при\ x = 0;x = 1.\]
\[\textbf{г)}\ \frac{x \cdot (x + 3)}{2x + 6} = 0\]
\[x(x + 3) = 0\]
\[x = 0;\ \ \ \ x + 3 = 0\]
\[\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ x = - 3.\]
\[Допустимые\ значения:\]
\[2x + 6 = 0\]
\[2x = - 6\]
\[x = - 6\ :2\]
\[x = - 3.\]
\[Все\ числа,\ кроме\ x = - 3.\]
\[То\ есть\ x = - 3\ не\ подходит.\]
\[Ответ:при\ x = 0.\]