1
(2x-1)(2x+1)/(x+3)<0<br>x=1/2 x=-1/2 x=-3
_ + _ +
-------------------(-3)------------(-1/2)---------(1/2)--------------------
x∈(-∞;-3) U (-1/2;1/2)
2
(4-2^(3-x))/(x-1)(x+1)≥0
4-2^(3-x)=0⇒2^(3-x)=4⇒3-x=2⇒x=1
x-1=0⇒x=1
x+1=0⇒x=-1
_ _ +
------------(-1)-----------------(1)-----------------------
+ _ +
x∈(1;1) U (1;∞)