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Se dau multimile:
A= (x / x ∈ N, 5x+2≥7 si 5x +2≤17)
B=(y / y ∈ N* )

Calculati A
∪B, A∩B, A-B, B-A


Răspuns :

5x≥7-2 => 5x≥5 => x≥1 5x≤17-2 => 5x≤15 => x≤3 1≤x≤3 => x apartine multimii 1,2,3 = A B ={ 1, 2 , 3 , ....., infinit } A reuniut cu B = multimea N stelat / star A intersectat cu B = 1, 2, 3 A-B = multimea vida B-A = 3,4,..... infinit