Question

Tìm abc biết abc + 3889 = abc1

 

Answer 1

 abc + 3889 = abc1.

 abc +3889 = abc x 10 + 1. 

abc x 10 - abc = 3889 - 1. 

abc x ( 10 - 1 ) = 3888.

abc x 9 =3888

abc =3888:9

abc = 432

vậy abc =432