Số tự nhiên nhỏ nhất có 4 chữ số chia hết cho 3 là: 1002
Số tự nhiên nhỏ nhất có 4 chữ số chia hết cho 9 là: 1008
1003 chia hết cho 3
1008 chia hết cho 9
nhầm
1002 chia hết cho 3
1008 chia hết cho 9
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