Question

va rog frumosss ajutatiii DAR COROANA SI 50 PUNCTE VA ROGG

Fie A={x | x ∈ Z si - 1 ≤ x < 4}
B={x | x ∈ Z si | x | ≤ 3}
Determinati elementele multimilor A si B
Efectuati A ∪ B
A - B

Answer 1

A={x | x ∈ Z ; -1 ≤ x < 4}

⇒A={-1 ; 0; 1; 2; 3}

B={x | x ∈ Z ; |x| ≤ 3}

⇒ |x| ≤ 3

⇒x∈{-3; -2; -1; 0; 1; 2; 3}

⇒B={-3; -2; -1; 0; 1; 2; 3}

A U B = {-1; 0; 1; 2; 3} U {-3; -2; -1; 0; 1; 2; 3}

A U B = {-3; -2; -1; 0; 1; 2; 3}

A - B = {-1; 0; 1; 2; 3} - {-3; -2; -1; 0; 1; 2; 3}

A - B = ∅ (A ⊂ B ⇒ A are doar elemente comune)

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