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tallfølgje eg ikkje klarar

Posted: 07/11-2005 23:09
by Guest
an = 1-[rot][/rot]n/ 1-n for n >1

korleis kan eg visa at 1-[rot][/rot]n/ 1-n = 1/1+[rot][/rot]n

Posted: 07/11-2005 23:23
by Solar Plexsus
(1 - [rot][/rot]n) / (1 - n) = (1 - [rot][/rot]n) / [(1 - [rot][/rot]n)(1 + [rot][/rot]n)] = 1/(1 + [rot][/rot]n).