\[\boxed{\text{277.}\text{\ }\text{ОК\ ГДЗ\ -\ домашка\ на\ 5}}\]
\[\textbf{а)}\ x² + 7x + 1 > - x^{2} + 10x - 1\]
\[2x^{2} - 3x + 2 > 0\]
\[D = 9 - 4 \cdot 2 \cdot 2 < 0\]
\[\Longrightarrow 2x^{2} - 3x + 2 > 0\ \ при\ \]
\[любом\ x;\]
\[\Longrightarrow x^{2} + 7x + 1 >\]
\[> - x^{2} + 10 - 1 \Longrightarrow при\ \]
\[любом\ x.\]
\[\textbf{б)} - 2x^{2} + 10x < 18 - 2x\]
\[2x^{2} - 12x + 18 > 0\]
\[x² - 6x + 9 > 0\ \]
\[(x - 3)^{2} > 0\]
\[x \in ( - \infty;3) \cup (3; + \infty).\]
\[\Longrightarrow - 2x^{2} + 10x < 18 - 2x \Longrightarrow\]
\[\Longrightarrow при\ любом\ x \neq 3.\]