gọi số bé là A (A khác 0)
A38 + A = 1553
A x 100 + 38 + A = 1553
A x 101 + 38 = 1553
A x 101 = 1553 - 38 = 1515
A = 1515 : 101 = 15
A38 = 1538
Đáp số: 15 và 1538
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