\[\boxed{\text{453\ (453).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[\textbf{а)}\ 0,2x(x - 1) -\]
\[- x(0,2x + 0,5) < 0,6x - 4\]
\[0,2x^{2} - 0,2x - 0,2x^{2} -\]
\[- 0,5x - 0,6x - 4 < 0\]
\[- 1,3x + 4 < 0\]
\[1,3x > 4\]
\[x > 3\frac{1}{13}.\]
\[\textbf{б)}\ 1,2x(3 - x) +\]
\[+ 0,4x(3x - 1) < x + 1,1\]
\[3,6x - 1,2x^{2} + 1,2x^{2} -\]
\[- 0,4x - x - 1,1 < 0\]
\[2,2x - 1,1 < 0\]
\[2,2x < 1,1\]
\[x < \frac{1}{2}\]
\[x < 0,5.\]
\[Ответ:\ \ а)\ x \in \left( 3\frac{1}{13};\ + \infty \right);\ \ \]
\[\ \ \ \ \ \ \ \ \ \ \ \ \ \ б)\ x \in ( - \infty;0,5)\ .\ \]
\(\boxed{\text{453.}\text{\ }\text{ОК\ ГДЗ\ -\ домашка\ на\ 5}}\)
\[\textbf{а)}\ \ xy < 4\]
\[y < \frac{4}{x}\]
\[\textbf{б)}\ xy > - 6\]
\[y > - \frac{6}{x}\]