\(\overline{abc}\times9=\overline{1abc}\Leftrightarrow9\overline{abc}=1000+\overline{abc}\Leftrightarrow8\overline{abc}=1000\Leftrightarrow\overline{abc}=125.\)
abc x 9 = 1abc
abc x 9 = 1000 + abc
abc x 9 - abc = 1000
abc x ( 9-1 ) = 1000
abc x 8 = 1000
abc = 1000 : 8
abc = 125
abcx9=1abc
abcx9=1000+abc
8xabc=1000
abc=1000:8=125
abc x 9 =1abc
=>abc x 9 =1000+abc
=>abc x 9 - abc = 1000
=>abc x (9-1)=1000
=>abc x 8 =1000
=> abc =1000 : 8
=> abc=125
Ta có: abc x 9 =1abc
=>abc x 9 =1000+abc
=>abc x 9 - abc = 1000
=>abc x (9-1)=1000
=>abc x 8 =1000
=> abc =1000 : 8
=> abc=125
Ta có: abc x 9 =1abc
=>abc x 9 =1000+abc
=>abc x 9 - abc = 1000
=>abc x (9-1)=1000
=>abc x 8 =1000
=> abc =1000 : 8
=> abc=125
Ta có: abc x 9 =1abc
=>abc x 9 =1000+abc
=>abc x 9 - abc = 1000
=>abc x (9-1)=1000
=>abc x 8 =1000
=> abc =1000 : 8
=> abc=125
Ta có: abc x 9 =1abc
=>abc x 9 =1000+abc
=>abc x 9 - abc = 1000
=>abc x (9-1)=1000
=>abc x 8 =1000
=> abc =1000 : 8
=> abc=125
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