\[\boxed{\text{1055.\ }\text{еуроки}\text{-}\text{ответы}\text{\ }\text{на}\text{\ }\text{пятёрку}}\]
\[\textbf{а)} - 9 < 3x < 18\ \ \ |\ :3\]
\[- 3 < x < 6\]
\[x \in ( - 3;6).\]
\[\textbf{б)}\ 1 < \frac{2x - 1}{2} < 2\ \ \ \ | \cdot 2\]
\[2 < 2x - 1 < 4\]
\[3 < 2x < 5\ \ \ \ |\ :2\]
\[1,5 < x < 2,5\]
\[x \in (1,5;2,5).\]
\[\textbf{в)}\ 3 \leq 5x - 1 \leq 4\]
\[4 \leq 5x \leq 5\ \ \ \ \ \ \ \ \ \ |\ :5\]
\[0,8 \leq x \leq 1\]
\[x \in \lbrack 0,8;1\rbrack.\]
\[\textbf{г)}\ 0 \leq \frac{1 - x}{3} \leq 1\ \ \ | \cdot 3\]
\[0 \leq 1 - x \leq 3\]
\[- 1 \leq - x \leq 2\]
\[- 2 \leq x \leq 1\]
\[x \in \lbrack - 2;1\rbrack.\ \]