<=> ( 481000 + abc ) : abc = 1481
<=> 481000 : abc + abc : abc = 1481
<=> 481000 : abc + 1 = 1481
<=> 481000 : abc = 1480
=> abc = 481000 : 1480
=> abc = 325
Vậy abc = 325
<=>(481000+ABC)/..................
<=>481000 CHIA HẾT CHO ABC+ABC......
<=>481000 CHIA HẾT CHO ABC+1=1481
=<=>ABC=481000 CHIA 1480
=>ABC=325
=>