giúp mình với nha

N

namama01

H

hiensau99

Tổng các số lập được là:
[TEX]\overline{915ab}+\overline{9ab15}+\overline{15ab9}+\overline{ab915}+\overline{ab159}+\overline{195ab}=91500+\overline{ab}+90000+100\overline{ab}+15+15000+10\overline{ab}+9+1000\overline{ab}+915+1000 \overline{ab}+159+15900+\overline{ab}[/TEX]
[TEX]=(91500+90000+15+15000+9+915+159+15900)+(\overline{ab}+100\overline{ab}+10\overline{ab}+1000\overline{ab}+1000\overline{ab}+\overline{ab})=213498+2112\overline{ab}=264186[/TEX]
\Rightarrow[TEX]2112\overline{ab}=50588 [/TEX]
\Rightarrow[TEX]ab=24[/TEX]
 
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