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Determinati nr narural n stiind ca 5^n+1=125
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Răspuns :

[tex] 5^{n+1} = 125 \Rightarrow 5^{n+1} = 5^{3}\Rightarrow n+1 = 3 \Rightarrow n = 2[/tex]
[tex]5^{n+1}=125 \\ \\ 5^{n+1}=5^{3} \\ \\ n+1=3 \\ \\ n=3-1 \\ \\ n=2[/tex]