x * (x+5)<0
{x<0
{x+5>0
{x>0
{x+5<0
{x<-5
x э (-5;0)
2. x^2<25
/x/<5
x<5, x>=0
x э [0,5)
x>-5, x<0
x э (-5,0)
3. 2x^2-3x-5<0
2x^2+2x-5x-5<0
2x×(x+1)-5(x+1)<0
(x+1)×(2x-5)<0
{x+1<0
{2x-5>0
{x+1>0
{2x-5<0
{x<-1
{x> 5/2
{x>-1
{x<5/2
