1
{x≥0
{x-2≠0⇒x≠2
x∈[0;20 U (2;∞)
2
{x²+x-2>0⇒(x+2)(x-1)>0⇒x<-2 U x>1
{x-5>0⇒x>5
\\\\\\\\\\\\ ////////////////////////////////
--------(-2)------------------(1)-----------(5)-----------
\\\\\\\\\\\\\\\\\\
x∈(5;∞)
3
{4-x²>0⇒(2-x)(2+x)>0⇒-2{6-x²-x≥0⇒x²+x-6≤0⇒(x+3)(x-2)≤0⇒-3≤x≤2
/////////////////////////////
---------[-3]-------------(-2)--------------------(2)-----------------
///////////////////////////////////////////////////
x∈(-2;2)