\[\boxed{\text{981.\ }\text{еуроки}\text{-}\text{ответы}\text{\ }\text{на}\text{\ }\text{пятёрку}}\]
\[\textbf{а)}\ \left\{ \begin{matrix} 57 - 7x > 3x - 2\ \ \\ 22x - 1 < 2x + 47 \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ }\]
\[\left\{ \begin{matrix} - 7x - 3x > - 2 - 57 \\ 22x - 2x < 47 + 1\ \ \ \ \\ \end{matrix} \right.\ \text{\ \ \ \ \ }\]
\[\left\{ \begin{matrix} - 10x > - 59 \\ 20x < 48\ \ \ \ \ \ \ \\ \end{matrix} \right.\ \]
\[\left\{ \begin{matrix} x < 5,9 \\ x < 2,4 \\ \end{matrix} \right.\ \Longrightarrow \ \ ( - \infty;2,4)\]
\[\textbf{б)}\ \left\{ \begin{matrix} 1 - 12y < 3y + 1 \\ 2 - 6y > 4 + 4y\ \ \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ \ }\]
\[\left\{ \begin{matrix} - 12y - 3y < 1 - 1 \\ - 6y - 4y > 4 - 2 \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ }\]
\[\left\{ \begin{matrix} - 15y < 0 \\ - 10y > 2 \\ \end{matrix} \right.\ \]
\[\left\{ \begin{matrix} y > 0\ \ \ \ \ \ \\ y < - 0,2 \\ \end{matrix}\text{\ \ } \right.\ \Longrightarrow \ \ нет\ решений\]
\[\textbf{в)}\ \left\{ \begin{matrix} 102 - 73z > 2z + 2 \\ 81 + 11z \geq 1 + z\ \ \ \ \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ \ }\]
\[\left\{ \begin{matrix} - 73z - 2z > 2 - 102 \\ 11z - z \geq 1 - 81\ \ \ \ \ \ \ \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ }\]
\[\left\{ \begin{matrix} - 75z > - 100 \\ 10z \geq - 80\ \ \ \ \ \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ \ \ }\]
\[\left\{ \begin{matrix} z < \frac{100}{75} \\ z \geq - 8 \\ \end{matrix} \right.\ , \Longrightarrow \ \left\lbrack - 8;1\frac{1}{3} \right)\]
\[\textbf{г)}\ \left\{ \begin{matrix} 6 + 6,2x \geq 12 - 1,8x \\ 2 - x \geq 3,5 - 2x\ \ \ \ \ \ \ \ \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ \ }\]
\[\ \left\{ \begin{matrix} 6,2x + 1,8x \geq 12 - 6 \\ - x + 2x \geq 3,5 - 2\ \ \ \ \ \\ \end{matrix} \right.\ \text{\ \ \ \ }\]
\[\ \left\{ \begin{matrix} 8x \geq 6 \\ x \geq 1,5 \\ \end{matrix} \right.\ \]
\[\left\{ \begin{matrix} x \geq \frac{3}{4}\text{\ \ \ \ } \\ x \geq 1,5 \\ \end{matrix} \right.\ \Longrightarrow \ \lbrack 1,5;\ + \infty)\]