Question

tim so abc biet; abc1-1abc=7506

so do la....

Answer 1

abc1-1abc=7506

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

10abc+1-1000-abc=7506

10abc-abc=7506+1000-1

(10-1)abc=8505

9abc=8505

abc=8505:9

abc=945

Answer 2

abc1 - 1abc = 7506

=> abc x 10 + 1 - 1000 - abc = 7506

=> abc x 9 - 999 = 7506

=> abc x 9 = 8505

=> abc = 945

Answer 3

số đó là 945 nha bn !!!!