Question

tim so ABC biet ABC1-1ABC=7506

Answer 1

=>(abc*10+1)-(1000+abc)=7506

=>(abc*10-abc)-(1000-1)=7506

=>abc*9=7506+999

=>abc*9=8505

=>abc=8505:9

=>abc=945

Answer 2

abc1 - 1abc = 7506

abc1 = 1abc + 7506

abc x 10 + 1 = 1000 + abc + 7506

abc x 10 - abc = 1000 - 1 + 7506

abc x 9 = 8505

abc = 8505 : 9 = 945

Vậy số abc là 945

Answer 3

abc1 -1abc=7506

abc*10+1=1000+abc+7506

abc*10-abc=1000-1+7506

abc*9=8505

abc=8505/9

abc=945

Answer 4

abc1 - 1abc = 7506

abc1 = 1abc + 7506

abc x 10 + 1 = 1000 + abc + 7506

abc x 10 - abc = 1000 - 1 + 7506

abc x 9 = 8505

abc = 8505 : 9 = 945

Vậy số abc là 945