Răspuns:
a) A = {0,1,2,3,4,5,6,7,8}
b) B = { -2, -1, 0, 1, 2, 3, 4, 5}
c) - 5 < 2x+1 < 7
-6 < 2x < 6
-3 < x < 3
C = {-2, - 1, 0, 1, 2}
d) 3,5 = 35/10 = 7/2
D = {7/2}
e) n e {0, 1, 2, 3,........}
E = { -2, 2, 6, 10, 14,......}
f) n e {0, 1, 2, 3, ......}
F = { -1, 0, 1, 2, 3, .......}