Question

Answer 1

a: A={x∈R|1<=x<5}

=>A=[1;5)

B={x∈R|x>=3}

=>B=[3;+∞)

b: A\(\cap\) B=[1;5)\(\cap\) [3;+∞)

=[3;5)

A\(\cup\) B=[1;5)\(\cup\) [3;+∞)

=[1;+∞)