Question

tìm a và b:1ab x 126 = 201ab

Answer 1

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 

Answer 2

\(\overline{1ab}\times126=\overline{201ab}\\ 100\times126+\overline{ab}\times126=20100+\overline{ab}\\ 125\times\overline{ab}=7500\\ \overline{ab}=60\\ a=6\\ b=0\)

Answer 3

\(\overline{1ab}\times126=\overline{201ab}\)

\(\left(100+\overline{ab}\right)\times126=20100+\overline{ab}\)

\(12600+\overline{ab}\times126=20100+\overline{ab}\)

\(12600+\overline{ab}\times125=20100\)

\(\overline{ab}\times125=20100-12600\)

\(\overline{ab}\times125=7500\)

\(\overline{ab}=7500:125\)

\(\overline{ab}=60\)

Vậy a=6, b=0