đề thi(7)

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thannonggirl

1ab x 126=201ab
(100+ab) x 126=20100+ab
100 x 126+ab x 126=20100+ab
12600+ab x 126=20100+ab
ab x 126-ab=20100-12600
ab x 126-ab x 1=7500
ab x (126-1)=7500
ab x 125=7500
ab=7500:125
ab=60 \Rightarrow a=6 và b=0
 
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