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Học tốt nhé!
Ta thấy 2a71b chia hết cho 2 và 5 nên 2a71b phải có tận cùng là 0 =>b=0.ta có 2a710.
2a710 chia hết cho 3 nên (2+a+7+1+0) sẽ chia hết cho 3.=>a=2,5,8.
Vậy a=2,b=0; a=5,b=0; a=8,b=0.
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