Алгебра 8 класс учебник Макарычев, Миндюк ответы – номер 978

а) $$ \left\{\begin{array} { l } { 0 , 4 x - 1 \leq 0 } \\ { 2 , 3 x \geq 4 , 6 } \end{array} \left\{\begin{array} { l } { 0 , 4 x \leq 1 } \\ { 2 , 3 x \geq 4 , 6 } \end{array} \left\{\begin{array} { l } { x \leq 1 : 0 , 4 } \\ { x \geq 4 , 6 : 2 , 3 } \end{array} \left\{\begin{array}{l} x \leq 2,5 \\ x \geq 2 \end{array}\right.\right.\right.\right. $$

     [2; 2,5]
б) $$ \left\{\begin{array} { l } { 0 , 7 x - 2 , 1 < 0 } \\ { \frac { 2 } { 3 } x > 1 } \end{array} \left\{\begin{array} { l } { 0 , 7 x < 2 , 1 } \\ { \frac { 2 } { 3 } x > 1 } \end{array} \left\{\begin{array} { l } { x < 2 , 1 : 0 , 7 } \\ { x > 1 : \frac { 2 } { 3 } } \end{array} \left\{\begin{array}{l} x<3 \\ x>1,5 \end{array}\right.\right.\right.\right. $$

     (1,5; 3)
в) $$ \left\{\begin{array} { l } { 0 , 3 x > 4 } \\ { 0 , 2 x + 1 < 6 } \end{array} \left\{\begin{array} { l } { 0 , 3 x > 4 } \\ { 0 , 2 x < 6 - 1 } \end{array} \left\{\begin{array} { l } { x > 4 : 0 , 3 } \\ { x < 5 : 0 , 2 } \end{array} \left\{\begin{array}{l} x>13 \frac{1}{3} \\ x<25 \end{array}\right.\right.\right.\right. $$

     (131/3; 25)
г) $$ \left\{\begin{array} { l } { \frac { 5 } { 6 } x - 1 0 \leq 0 } \\ { 3 x \leq 1 \frac { 1 } { 3 } } \end{array} \left\{\begin{array} { l } { \frac { 5 } { 6 } x \leq 1 0 } \\ { 3 x \leq 1 \frac { 1 } { 3 } } \end{array} \left\{\begin{array} { l } { x \leq 1 0 : \frac { 5 } { 6 } } \\ { x \leq \frac { 4 } { 3 } : 3 } \end{array} \left\{\begin{array}{l} x \leq 12 \\ x \leq \frac{4}{9} \end{array}\right.\right.\right.\right. $$

     (−∞; 4/9]