2. a) {-3, -2, -1, 0, 1,2}
b) {.... -7, -6}
c) {......., 6,7,8... } /{1,2,3,4,5}
d) {.... -7, -6}
3. a) [-2, 5/2]
b) (-1/2, 4/3)
c) [-2, -1/2) U (4/3, 5/2]
d) Multime vida
