Question

A={x∈R/|x|<6} si B={x∈R/x≥3}a)Scrieti A si B sub forma de intervale;b)Efectuati AuB;AnB;A\B;BuN;A\N *

Answer 1

|x|<6 => -6<x<6 => A=(-6, 6)
x>sau=3 => B=[3, +infinit)
AuB = (-6, +infinit)
AnB = [3, 6)
A\B = (-6, 3)
BuN = {3, 4, 5, ..., n}
A\N* = A\{1, 2 ,3 ,4, 5}