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Log in baza 5 din (2x-1)=2

Răspuns :

Log5(2x-1)=2 ; 2x-1=5^2 ; 2x-1=25 ; 2x=26 ; ×=13.
Log5(2*13-1)=log5(25)=log5(5^2)=2 * log5(5) = 2*1 =2 Succes.