1abx126=201ab
(100+ab)x126=20100+ab
12600+126ab=20100+ab
126ab - ab= 20100 - 12600
125ab= 7500
ab= 7500:125= 60
Vậy a = 6; b=0
\(\overline{1ab}\times126=\overline{201ab}\\ 100\times126+\overline{ab}\times126=20100+\overline{ab}\\ 125\times\overline{ab}=7500\\ \overline{ab}=60\\ a=6\\ b=0\)
\(\overline{1ab}\times126=\overline{201ab}\)
\(\left(100+\overline{ab}\right)\times126=20100+\overline{ab}\)
\(12600+\overline{ab}\times126=20100+\overline{ab}\)
\(12600+\overline{ab}\times125=20100\)
\(\overline{ab}\times125=20100-12600\)
\(\overline{ab}\times125=7500\)
\(\overline{ab}=7500:125\)
\(\overline{ab}=60\)
Vậy a=6, b=0
