a) nếu a chia hết cho 3 và b chia hết cho 3 thì tổng a+b chia hết cho 3
b) nếu a chia hết cho 2 và b chia hết cho 4 thì tổng a+b chia hết cho 2
c) nếu a chia hết cho 6 và b chia hết cho 9 thì tổng a+b chia hết cho 3
a) Chọn số 3
b) Chọn số 2
c) chọn số 3
k mình nha
a) Nếu a chia hết cho 3 và b chia hết cho 3 thì tổng a + b chia hết cho 6 ; 9 ; 3 => 3
b) Nếu a chia hết cho 2 và b chia hết cho 4 thì tổng a + b chia hết cho 4 ; 6 ; 2 => 2
c) Nếu a chia hết cho 6 và b chia hết cho 9 thì tổng a + b chia hết cho 6 ; 3 ; 9 => 3
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