Theo đề bài ta có:
\(2379ab+23ab79+7923ab+79ab23+ab7923+ab2379=2989896.\)
=> \(237900+ab+230079+100.ab+792300+ab+790023+100.ab+10000.ab+7923+10000.ab+2379=989896.\)
=> \(20202.ab+2060604=2989896\)
=> \(20202.ab=2989896-2060604\)
=> \(20202.ab=929292\)
=> \(ab=929292:20202\)
=> \(ab=46.\)
Vậy \(ab=46.\)
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