Răspunsuri

2014-10-26T13:58:37+02:00
A = 8+8² +8³ +.................+8^2011 = 8(1+8+8²+8³+.............+8^2010) =8[(1+64)+8²(1+64 ) +.......+8^2008 (1+64)] = 8·65(1+8² +............+8^2008) =8·5·13(1+8² +.........    )divizibil cu 13 ⇒ r=0