[tex] \frac{\overline{ab}}{\overline{ba}} = \frac{12}{10} [/tex]
[tex] \frac{10a+b}{10b+a} = \frac{6}{5} [/tex]
[tex]5(10a+b)=6(10b+a)[/tex]
[tex]50a+5b=60b+6a[/tex]
[tex]44a=55b ~~~~~|:11[/tex]
[tex]4a=5b[/tex]
=>[tex]a=5 ~si ~ b=4[/tex]
Verificare :
[tex] \frac{54}{45} =1,2~ok[/tex]
