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a) Nếu a ⋮ 3 và b ⋮ 3 thì tổng a + b chia hết cho 6 ; 9 ; 3 b) Nếu a ⋮ 2 và b ⋮ 4 thì tổng a + b chia hết cho 4 ; 2 ; 6 c) Nếu a ⋮ 6 và b ⋮ 9 thì tổng a + b chia hết cho 6 ; 3 ; 9
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