Răspunsuri

2014-10-18T18:02:41+03:00
N = 2+2²+2³+........+2^2007 ⇒ N+2 = (2+2)+2²+2³ +.........+2^2007) = (2²+2²)+2³+2^4 +.........+2^2007=(2³+2³)+..........+2^2007 = .......... =2^2007 +2^2007 =2^2008
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