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2014-01-16T21:02:29+02:00
2014-01-16T21:06:38+02:00
ab=2/9ba => 10a+b=2/9*10b + 2/9*a => 10a-2/9*a= 20/9*b-b => 88a=11b => 8a=b => a=1; b=8 
Numarul ab este 18.
  
8 4 8