1684 1698 . 1675 . .

" ", "" " ". .
18.03.2013

LiveJournal Vkontakte Facebook Twitter

1...2 3 

, , 35, 560.

: 7, -28, 112, -448 -112/3, -462/3, -1862/3, -7462/3.


160 , , 36.

: 12 + 24 + 48 + 96 9/2 + 27/2 + 81/2 + 243/2.


11/18, , , 18. .

: 1/3, 1/6, 1/9.


19 a1, a2, a3..., , a4 + a8 + a12 + a16 = 224.

: S19 = 1064.


a1, a2, ..., an, an + 1 . ,

1/a 1a 2 + 1/ a 2a 3 + ... + 1/a na n + 1 = n/a1a n + 1.

: , , kak + 2 + a1 = (k + 1)ak + 1.


, n Sn Sn = 4n2 - 3n. .

: 1, 9, 17.


1...2 3 
2009-2012 . " - !" - , . .
Rambler's Top100