Răspuns :

Rayzenid

[tex]\dfrac{2^{65}-2^{63}}{2^{66}+2^{67}} = \dfrac{2^{63}\cdot(2^2-1)}{2^{63}\cdot (2^3+2^4)}= \dfrac{4-1}{8+16} = \dfrac{3}{24} = \dfrac{1}{8}[/tex]

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