Explicație pas cu pas:
[tex]1. \: \: \: x \times ( \frac{1}{1} - \frac{1}{63} ) = 2 - \frac{64}{63} \\ \\ x \times ( \frac{63}{63} - \frac{1}{63} ) = \frac{126}{63} - \frac{64}{63} \\ \\ x \times \frac{62}{63} = \frac{62}{63} \: \: = > x = 1[/tex]
La al doilea nu imi aduc aminte metoda..
