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"b = ( 5 la 62 + 5 la 61 + 5 la 60 ) * 961 cub perfect"

Răspuns :

b=[tex] 5^{62} + 5^{61} + 5^{60} )*961=[/tex]
=[tex]5^{60}*( 5^{2} + 5^{1} + 1 )* 31^{2}=[/tex]
=[tex]5^{60}*( 25 + 5 + 1 )* 31^{2}=[/tex]
=[tex]5^{60}*31* 31^{2}=[/tex]
=[tex] (5^{20}) ^{3}*31^{3}[/tex]=
=[tex](5^{20}*31) ^{3}[/tex]
care este cub perfect