Question

Tìm số abc biết:abc1-1abc=7506

Answer 1

abc1 - 1abc = 7506

=> abc x 10 + 1 - 1000 - abc = 7506

=> abc x 9 = 7506 + 1000 - 1

=> abc x 9 = 8505

=> abc = 8505 : 9

=> abc = 945

Answer 2

abc1-1abc=7506

[abcx10+1]-[1000+abc]=7506

abcx9-1+1000=7506

abcx9=7506+1000-1

abcx9=8505

abc=945