Conjuntos Numéricos III Flashcards

1
Q

ℤ ⊂ ℕ

A

Errado, ℕ não contém números negativos.
Contraexemplo: ℕ ⊂ ℤ.

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2
Q

∅ ⊂ ℤ*

A

Certo. O conjunto vazio é subconjunto de qualquer conjunto.

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3
Q

{-1, 3} ⊂ ℤ-

A

Errado.

Contraexemplo: 3 ∉ ℤ-

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4
Q

ℤ+* ⊃ ℕ

A

Errado, pois ℤ+* ⊅ 0 (zero).

Contraexemplo: 0 ∉ ℤ+* , mas 0 ∈ ℕ

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5
Q

5 ∈ ℤ

A

Sim

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6
Q

-15 ∈ ℤ+*

A

Errado

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7
Q

{1, 2, 3} ∈ ℤ

A

Errado
Contraexemplo: {1, 2, 3} ⊂ ℤ

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8
Q

ℤ+* ⊂ ℕ

A

Certo.

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