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determinati nr nat. n , stiind ca 2^n+2^n+2+2^n+1=56 urgent va rog!!!

Răspuns :

2^n +2^n+2 + 2^n+1 = 56
⇒ 2^n ( 1+2²+2) = 2³ ·7
⇒2^n ·7 = 2³ ·7
n=3