Trả lời:
\(abc7+5778=7abc\)
\(\Leftrightarrow abc0+7+5778=7000+abc\)
\(\Leftrightarrow abc\times10-abc=7000-7-5778\)
\(\Leftrightarrow abc\times9=1215\)
\(\Leftrightarrow abc=135\)
Vậy \(abc=135\)
abc7 + 5778 = 7abc
=> abc x 10 + 7 + 5778 = 7000 + abc
=> abc x 10 - abc = 7000 - 5778 - 7
=> 9 x abc = 1215
=> abc = 135
Vậy abc = 135
trả lời:
abc x 10 + 7 + 5778 = 7000 + abc
abc x 10 - abc = 7000 - 5778 - 7
abc x 9 = 1215
abc = 1215 : 9
abc = 135
vậy abc = 135
