(25 PONTOS) EXERCÍCIO DE ARITMÉTICA:

Se a ≡ b (mod m) e c ≡ d (mod m) entao:

1 ) a + c ≡ b + d
2) a - c ≡ b - d
3) ka ≡ kb (mod m) ∀ k ∈ Z
4) ac ≡ bd (mod m)
5) aⁿ ≡ bⁿ (mod m) ∀ n ∈ IN
6) Se mdc (k, m) = d entao ka ≡ kb (mod m) ⇔ a ≡ b (mod m/d)

Considerem todas os items acima verdade, demostre o item 6.

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