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單雙數,又叫奇偶數,係數學概念,判斷一個整數可唔可以畀 2 整除,可以就叫雙數(偶數),唔可以就叫單數(奇數)。0 可以畀 2 整除,所以係雙數。
上面嘅單雙性淨係適用喺整數( 係整數),因此 呢啲唔適用。
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