Salut!
a)
A = { x € Z | | 2x + 3 | ≤ 5 }
| 2x + 3 | ≤ 5 <=> -5 ≤ 2x + 3 ≤ 5 | -3
-8 ≤ 2x ≤ 2 | : 2
-4 ≤ x ≤ 1, x € Z ==> x = { -4; -3; -2; -1; 0; 1 }
B = { x € R | -4 < x < 6 }
-4 < x < 6 ==> x € ( -4; 6 )
==> B = ( -4; 6 )
b)
A U B = [ -4; 6 )
A intersectat cu B = ( -4; 1]
