sedinalana

Verified answer

1/(x+1)+1/(3-x)-1≤0
(3-x+x+1-3x+x²-3+x)/(x+1)(3-x)≤0
(x²-2x+1)/(x+1)(3-x)≤0
(x-1)²/(x+1)(3-x)≤0
x=1  x=-1  x=3
             _                  +                  +                    _
----------------(-1)-------------[1]---------------(3)------------------
x∈(-∞;-1) U (3;∞) U {1}