Question

Пожалуйста решение и ответы написать на листочке

Answer 1

Ответ:решение на фото

Answer 2

Вариант 4

( 1 )

$\displaystyle\\\left \{ {{3-2x<13} \atop {5x-2<15}} \right.\\\\\left \{ {{-2x<13-3} \atop {5x<15+2}} \right.\\\\\left \{ {{-2x<10} \atop {5x<17}} \right.\\\\\left \{ {{x>10:(-2)} \atop {x<17:5}} \right.\\\\\left \{ {{x>-5} \atop {x<3\frac{2}{5} }} \right. \\\\\left \{ {{x>-5} \atop {x<3,4}} \right.$

x ∈ ( -5 ; 3,4 )

( 2 )

$\displaystyle\\\left \{ {{6+6,2x\geq 12-1,8x} \atop {2-x\geq 3,5-2x}} \right. \\\\\left \{ {{6,2x+1,8x\geq 12-6} \atop {-x+2x\geq 3,5-2}} \right. \\\\\left \{ {{8x\geq 6} \atop {x\geq 1,5}} \right.\\\\\left \{ {{x\geq 6:8} \atop {x\geq 1,5}} \right. \\\\\left \{ {{x\geq 0,75} \atop {x\geq 1,5}} \right.$

x ∈ [ 1,5 ; + ∞ )

( 3 )

$\displaystyle\\-1<5x+4<19\\\\\left \{ {{5x+4>-1} \atop {5x+4<19}} \right. \\\\\left \{ {{5x>-1-4} \atop {5x<19-4}} \right. \\\\\left \{ {{5x>-5} \atop {5x<15}} \right. \\\\\left \{ {{x>-5:5} \atop {x<15:5}} \right. \\\\\left \{ {{x>-1} \atop {x<3}} \right.$

x ∈ ( -1 ; 3 )