Răspuns :
Avem o proprietate:
[tex] x^{log_{x}n}=n [/tex]
[tex]log_{2}3*log_{3}5*log_{5}8=log_{2}3^{log_{3}5}*log_{5}8=\\\\ =log_{2}5*log_{5}8=log_{2}5^{log_{5}8}=log_{2}8=3[/tex]
[tex] x^{log_{x}n}=n [/tex]
[tex]log_{2}3*log_{3}5*log_{5}8=log_{2}3^{log_{3}5}*log_{5}8=\\\\ =log_{2}5*log_{5}8=log_{2}5^{log_{5}8}=log_{2}8=3[/tex]