\[\boxed{\text{236\ (236).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
Пояснение.
Решение.
\[\textbf{а)}\ f(x) = |x^{2} - 2x|\]
\[Нули\ функции:\]
\[x^{2} - 2x = 0\]
\[x(x - 2) = 0\]
\[x = 0;\ \ \ \ x = 2.\]
\[При\ x < 0:\]
\[f(x) = x^{2} - 2x;\]
\[При\ 0 \leq x \leq 2:\]
\[f(x) = - x^{2} + 2x;\]
\[При\ x > 2:\]
\[f(x) = x^{2} - 2x.\]
\[\]
\[\textbf{б)}\ f(x) = x^{2} - 2|x|\]
\[При\ x < 0:\]
\[f(x) = x^{2} + 2x;\]
\[При\ x \geq 0:\]
\[f(x) = x^{2} - 2x.\]