Question

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Fie multimile A = { x ∈ ℕ | 2x + 5 ≤ 20 } si B = { x ∈ ℕ | 3 ≤ x } . Atunci multimea A\B = {...}

Answer 1

2x + 5 =< 20. (=< - mai mic sau egal)
x =< (15-5)/2. (=> - mai mare sau egal)
x =< 7
A={0,1,2,3,4,5,6,7}
B : x => 3
B={3,4,5,6,7,.....}
A/B = {0,1,2}