Question

Determinati
a) (-1;1)U[1;+∞)
b)(-∞,√10)∩ N*
c) daca I = {X∈ R , |X|≤5}si A={-2,-1,1,3,4} determinati I ∩ A
D) A∪B=, A∩B , A-B,B-A DACA A={x∈R , |x=5|≤3} si B={x∈ R , |2x+1|<9}

Answer 1

a) (-1,+ ∞)
b) {1,2,3}
c) I= [-5, 5] , I∩A={-2,-1,1,3,4}
d) -3 ≤ x+5≤3....scad 5
   -8≤ x≤ -2
A= [-8,-2]
-9≤2x+1≤9    ...scad 1
-10≤2x≤8....impart la 2
-5≤x≤4
B=[-5,4]
A∪B=[-8,4]
A∩B=[-5,-2]
A-B=[-8,-5)
B-A=(-2,4]