=>(abc*10+1)-(1000+abc)=7506
=>(abc*10-abc)-(1000-1)=7506
=>abc*9=7506+999
=>abc*9=8505
=>abc=8505:9
=>abc=945
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
abc1 -1abc=7506
abc*10+1=1000+abc+7506
abc*10-abc=1000-1+7506
abc*9=8505
abc=8505/9
abc=945
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
