Question

trebuie urgent exercițiul 3​

Answer 1

a)11,31

b)-7,17

c)*semnul de inclus dar taiat*

d)inclus

Answer 2

$\it a)\ \ \{11,\ \ 21\}\\ \\ b)\ \ \{\bf{-7,\ \ 17}, \it 9,\ 19,\ 27\}\\ \\ c)\ \notin\\ \\ d)\ \subset$