Question

решите неравенство (2х+5)(8-x)<0

Answer 1

Ответ: x∈(-∞;-2.5)∪(8;+∞)

$\left \{ {{2x+5<0} \atop {8-x<0}} \right. \\\left \{ {{2x<-5} \atop {-x<-8}} \right. \\\left \{ {{x<-2.5} \atop {x>8}} \right.$