Question

срочно нужно сделать пж​

Answer 1

1.

$\left \{ {{3x+6\geq 0} \atop {10-2x\geq 0}} \right.=>\left \{ {{3x\geq -6} \atop {2x\leq 10}} \right. =>\left \{ {{3x:3\geq -6:3} \atop {2x:2\leq 10:2}} \right. =>\left \{ {{x\geq -2} \atop {x\leq 5}} \right. =>-2\leq x\leq 5$    

  $-2\leq x\leq 5$

Ответ: [-2;   5]

2.

$\left \{ {{57-7x>3x-2} \atop {22x-1<2x+47}} \right. =>\left \{ {{-7x-3x>-57-2} \atop {22x-2x<1+47}} \right. =>\left \{ {{-10x>-59} \atop {20x<48}} \right. =>$

$=>\left \{ {{-10x:(-10)<-59:(-10)-59} \atop {20x:20<48:20}} \right. =>\left \{ {{x<5,9} \atop {x<2,4}} \right. =>x<2,4$

Ответ: (-∞;  2,4)

3.

      $-3<2x-1<3$

$-3+1<2x-1+1<3+1$

       $-2<2x<4$

$-2:2<2x:2<4:2$

         $-1<x<2$

Ответ: (-1;  2)