Question

СРОЧНО ПРОШУ!!!!ДАЮ ВСЕ СВОИ БАЛЛЫ!!!

Answer 1

1.    

 $\left \{ {{2x>7} \atop {0,5x<4}} \right. =>\left \{ {{2x:2>7:2} \atop {0,5x:0,5<4:0,5}} \right. =>\left \{ {{x>3,5} \atop {x<8}} \right. => 3,5<x < 8$

Ответ:   (3,5;  8)

2.

$\left \{ {{0,2x<1} \atop {3x>4,5}} \right. =>\left \{ {{0,2x:0,2<1:0,2} \atop {3x:3>4,5:3}} =>\right. \left \{ {{x<5} \atop {x>1,5}} \right. =>1.5 <x <5$

Ответ:   (1,5;  5)

3.

$\left \{ {{0,4x<2} \atop {-2x<4}} \right. =>\left \{ {{0,4x:0,4<2:0,4} \atop {-2x:(-2)>4:(-2)}} \right.=>\left \{ {{x<5} \atop {x>-2}} \right.=>-2<x<5$

Ответ:   (-2;  5)

4.

$\left \{ {{-3x>-24} \atop {0,8x>4}} \right. =>\left \{ {{-3x:(-3)<-24:(-3)} \atop {0,8x:0,8>4:0,8}} \right. =>\left \{ {{x<8} \atop {x>5}} \right. =>5<x<8$

Ответ:   (5;  8)