[tex]\displaystyle\bf\\Explicatie:\\\\Un~sfert~dintr-un~numar~este~o~patrime~din~aacel~numar.\\\\De~exemplu:\\Un sfert~din~x=\frac{x}{4}\\\\Rezolvare:\\\\Un~ sfert~din~2^{17}=\frac{2^{17}}{4}=\frac{2^{17}}{2^2}=2^{17-2}=\boxed{\bf2^{15}~Km^2}[/tex]
